diff --git a/regression_test/RAW/Bug546231/.gitignore b/regression_test/RAW/Bug546231/.gitignore
new file mode 100644
index 0000000000000000000000000000000000000000..fed16cf98577711d4081e12966fc4de18a9cc4d6
--- /dev/null
+++ b/regression_test/RAW/Bug546231/.gitignore
@@ -0,0 +1,7 @@
+Bug546231
+Bug546231.exe
+Bug546231*.hh
+Bug546231*.cc
+*.d
+compile
+Bug546231*.log
diff --git a/regression_test/RAW/Bug546231/Bug546231.ttcn b/regression_test/RAW/Bug546231/Bug546231.ttcn
new file mode 100644
index 0000000000000000000000000000000000000000..40e03391dfb6bf193cb651349d1c99471e13b09b
--- /dev/null
+++ b/regression_test/RAW/Bug546231/Bug546231.ttcn
@@ -0,0 +1,60 @@
+/******************************************************************************
+ * Copyright (c) 2000-2019 Ericsson Telecom AB
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.html
+ *
+ * Contributors:
+ * Baranyi, Botond – initial implementation
+ * Szalai, Gabor
+ *
+ ******************************************************************************/
+
+module Bug546231 {
+
+external function dec_R2(in octetstring stream) return R2
+with { extension "prototype(convert)" extension "decode(RAW)" }
+
+type record R2 {
+ integer lengthfield,
+ record of integer listfield,
+ integer last_field
+} with {
+ variant (lengthfield) "LENGTHTO(listfield)"
+ variant (lengthfield) "UNIT(elements)"
+}
+
+type component CT {};
+
+testcase tc1() runs on CT {
+ var R2 res := dec_R2('0000'O);
+ var R2 exp := { lengthfield := 0, listfield := { }, last_field := 0 };
+ if (res == exp) {
+ setverdict(pass);
+ }
+ else {
+ setverdict(fail, "Got: ", res, ", expected: ", exp);
+ }
+}
+
+testcase tc2() runs on CT {
+ var R2 res := dec_R2('010102'O);
+ var R2 exp := { lengthfield := 1, listfield := { 1 }, last_field := 2 };
+ if (res == exp) {
+ setverdict(pass);
+ }
+ else {
+ setverdict(fail, "Got: ", res, ", expected: ", exp);
+ }
+}
+
+control {
+ execute(tc1());
+ execute(tc2());
+}
+
+} with {
+ encode "RAW"
+}
+
diff --git a/regression_test/RAW/Bug546231/Makefile b/regression_test/RAW/Bug546231/Makefile
new file mode 100644
index 0000000000000000000000000000000000000000..c525e1307284173a3b4814eaaf6d366f143ad5bb
--- /dev/null
+++ b/regression_test/RAW/Bug546231/Makefile
@@ -0,0 +1,147 @@
+##############################################################################
+# Copyright (c) 2000-2019 Ericsson Telecom AB
+# All rights reserved. This program and the accompanying materials
+# are made available under the terms of the Eclipse Public License v2.0
+# which accompanies this distribution, and is available at
+# https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.html
+#
+# Contributors:
+# Botond, Baranyi
+#
+##############################################################################
+TOPDIR := ../..
+include ../../Makefile.regression
+
+# WARNING! This Makefile can be used with GNU make only.
+# Other versions of make may report syntax errors in it.
+
+#
+# Do NOT touch this line...
+#
+.PHONY: all archive check clean dep objects
+
+.SUFFIXES: .d
+
+#
+# Set these variables...
+#
+
+# Flags for dependency generation
+CXXDEPFLAGS = -MM
+
+ifeq ($(PLATFORM), WIN32)
+# Silence linker warnings.
+# Overridden by Makefile.cfg
+endif
+
+# Flags for the TTCN-3 and ASN.1 compiler:
+COMPILER_FLAGS +=
+
+# Execution mode: (either ttcn3 or ttcn3-parallel)
+TTCN3_LIB = ttcn3$(RT2_SUFFIX)$(DYNAMIC_SUFFIX)
+
+
+#
+# You may change these variables. Add your files if necessary...
+#
+
+# TTCN-3 modules of this project:
+TTCN3_MODULES = Bug546231.ttcn
+
+# ASN.1 modules of this project:
+ASN1_MODULES =
+
+# C++ source & header files generated from the TTCN-3 & ASN.1 modules of
+# this project:
+GENERATED_SOURCES = $(TTCN3_MODULES:.ttcn=.cc) $(ASN1_MODULES:.asn=.cc)
+GENERATED_HEADERS = $(GENERATED_SOURCES:.cc=.hh)
+ifdef SPLIT_TO_SLICES
+POSTFIXES := $(foreach file, $(SPLIT_TO_SLICES), $(addsuffix $(file), _part_))
+POSTFIXES := $(foreach file, $(POSTFIXES), $(addprefix $(file), .cc))
+GENERATED_SOURCES2 := $(foreach file, $(GENERATED_SOURCES:.cc=), $(addprefix $(file), $(POSTFIXES)))
+GENERATED_SOURCES += $(GENERATED_SOURCES2)
+endif
+# C/C++ Source & header files of Test Ports, external functions and
+# other modules:
+USER_SOURCES =
+USER_HEADERS = $(USER_SOURCES:.cc=.hh)
+
+# Object files of this project that are needed for the executable test suite:
+OBJECTS = $(GENERATED_OBJECTS) $(USER_OBJECTS)
+
+GENERATED_OBJECTS = $(GENERATED_SOURCES:.cc=.o)
+
+USER_OBJECTS = $(USER_SOURCES:.cc=.o)
+
+DEPFILES = $(USER_OBJECTS:.o=.d) $(GENERATED_OBJECTS:.o=.d)
+
+
+# The name of the executable test suite:
+TARGET = Bug546231$(EXESUFFIX)
+
+
+# Rules for building the executable...
+#
+
+all: $(TARGET)
+
+objects: $(OBJECTS) ;
+
+$(TARGET): $(OBJECTS)
+ if $(CXX) $(LDFLAGS) -o $@ $^ \
+ -L$(TTCN3_DIR)/lib -l$(TTCN3_LIB) \
+ -L$(OPENSSL_DIR)/lib -lcrypto \
+ -L$(XMLDIR)/lib $($(PLATFORM)_LIBS); \
+ then : ; else $(TTCN3_DIR)/bin/titanver $(OBJECTS); exit 1; fi
+
+.cc.o .c.o:
+ $(CXX) -c $(CPPFLAGS) $(CXXFLAGS) -o $@ $<
+
+.cc.d .c.d:
+ @echo Creating dependency file for '$<'; set -e; \
+ $(CXX) $(CXXDEPFLAGS) $(CPPFLAGS) $(CXXFLAGS) $< \
+ | sed 's/\($*\)\.o[ :]*/\1.o $@ : /g' > $@; \
+ [ -s $@ ] || rm -f $@
+
+$(GENERATED_SOURCES) $(GENERATED_HEADERS): compile
+ @if [ ! -f $@ ]; then $(RM) compile; $(MAKE) compile; fi
+
+compile: $(TTCN3_MODULES) $(ASN1_MODULES)
+ $(TTCN3_COMPILER) $(COMPILER_FLAGS) $^ - $?
+ touch $@
+
+
+clean:
+ -$(RM) $(TARGET) $(OBJECTS) $(GENERATED_HEADERS) \
+ $(GENERATED_SOURCES) compile $(DEPFILES) \
+ tags *.log
+
+distclean: clean
+ -$(RM) $(DEPFILES)
+
+
+dep: $(GENERATED_SOURCES) $(USER_SOURCES) ;
+
+ifeq ($(findstring n,$(MAKEFLAGS)),)
+ifeq ($(filter clean distclean check compile archive diag,$(MAKECMDGOALS)),)
+-include $(DEPFILES)
+endif
+endif
+
+
+
+diag:
+ $(TTCN3_COMPILER) -v 2>&1
+ $(TTCN3_DIR)/bin/mctr_cli -v 2>&1
+ $(CXX) -v 2>&1
+ @echo TTCN3_DIR=$(TTCN3_DIR)
+ @echo OPENSSL_DIR=$(OPENSSL_DIR)
+ @echo XMLDIR=$(XMLDIR)
+ @echo PLATFORM=$(PLATFORM)
+
+#
+# Add your rules here if necessary...
+#
+
+run: $(TARGET) ./config.cfg
+ ./$^
diff --git a/regression_test/RAW/Bug546231/config.cfg b/regression_test/RAW/Bug546231/config.cfg
new file mode 100644
index 0000000000000000000000000000000000000000..ea2a4db27956c0717fa0d5c4c8ceb20359e15f91
--- /dev/null
+++ b/regression_test/RAW/Bug546231/config.cfg
@@ -0,0 +1,20 @@
+###############################################################################
+# Copyright (c) 2000-2019 Ericsson Telecom AB
+# All rights reserved. This program and the accompanying materials
+# are made available under the terms of the Eclipse Public License v2.0
+# which accompanies this distribution, and is available at
+# https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.html
+#
+# Contributors:
+# Botond, Baranyi
+#
+###############################################################################
+[LOGGING]
+LogFile := "Bug546231.log"
+FileMask := LOG_ALL
+ConsoleMask := TTCN_ERROR | TTCN_TESTCASE | TTCN_STATISTICS
+LogSourceInfo := Yes
+[EXECUTE]
+Bug546231.control
+
+[TESTPORT_PARAMETERS]
diff --git a/regression_test/RAW/Makefile b/regression_test/RAW/Makefile
index 9db9d5da0a942312e0120cb0d721729bebd812c0..1e7747ced4fd792faa820e55d8459272a5fca0fd 100644
--- a/regression_test/RAW/Makefile
+++ b/regression_test/RAW/Makefile
@@ -19,7 +19,7 @@ TOPDIR := ..
include $(TOPDIR)/Makefile.regression
RDIRS = Examples HN25015 HQ26535 HQ49956 HS16977 ustr Annex_E_variants Bug521125 \
- Lengthto_Offset Bug522656 RAW_integer RAW_bitstring ForceOmit
+ Lengthto_Offset Bug522656 RAW_integer RAW_bitstring ForceOmit Bug546231
all dep clean run distclean:
for dir in $(RDIRS); do (cd $$dir && $(MAKE) $@) || exit; done