diff --git a/utils/ci/scripts/25_check_inline_docu.sh b/utils/ci/scripts/25_check_inline_docu.sh
index ae0f132d8cdcdce6cc688250f2549862b70a1149..c9c1f577cffe7aa5341dd870d1c19c107196326a 100755
--- a/utils/ci/scripts/25_check_inline_docu.sh
+++ b/utils/ci/scripts/25_check_inline_docu.sh
@@ -14,51 +14,73 @@
 # This script checks the inline documentation using doxygen
 ################################################################################
 
-MYDIR="$(dirname "$(readlink -f $0)")"
+filter() {
+    local version="$1"
+    local message="$2"
+    local sed_command="$3"
+
+    # Version Comparison
+    # Based on: https://unix.stackexchange.com/a/285928
+    # Creator:  Luciano Andress Martini
+    # Licence:  CC BY-SA 4.0 - https://creativecommons.org/licenses/by-sa/4.0/
+    if [ "$(printf '%s\n' "$version" "$doxy_version" | sort -V | head -n1)" = "$version" ]; then
+        echo "Filtering warning/errors for doxygen $version: $message"
+        sed -i "$sed_command" "doc/DoxygenWarningLog.txt"
+    fi
+}
+
+MYDIR="$(dirname "$(readlink -f "$0")")"
 cd "$MYDIR/../../../../build" || exit 1
 
+doxy_version="$(doxygen --version)"
+echo "Doxygen Version $doxy_version"
 make MantleAPI_doc
 
-# version comparison - https://unix.stackexchange.com/a/285928
-# under CC BY-SA 4.0 - https://creativecommons.org/licenses/by-sa/4.0/
+# filter diverse erroneous messages due to bugs in the individual doxygen versions
 
-# dealing with bugs in Doxygen 1.8.17 (or earlier)
 # bug description - https://github.com/doxygen/doxygen/issues/7411
 # fixed in 1.8.18 - https://github.com/doxygen/doxygen/pull/7483
-if [ "$(printf '%s\n' "1.8.17" "$doxy_version" | sort -V | head -n1)" = "$doxy_version" ]; then
-     echo "Filtering Doxygen warnings \"return type of member ... is not documented\" (see https://github.com/doxygen/doxygen/issues/7411)"
-     sed -i '/warning: return type of member/d' "doc/DoxygenWarningLog.txt"
-fi
+filter "1.8.17" \
+       "Warnings \"return type of member ... is not documented\" (see https://github.com/doxygen/doxygen/issues/7411)" \
+       "/warning: return type of member/d"
+
+# issues with markdown importer
+filter "1.9.1" \
+       "Warning: README\.md##: warning: Unsupported xml/html tag <TAG> found" \
+       "/README.md:[0-9]\+: warning: Unsupported xml\/html tag <.*> found/d"
+
+# issues with quoted text
+filter "1.9.1" \
+       "Warning: floating_point_helper: Exlicit link request to 'epsilon()' could not be resolved" \
+       "/warning: explicit link request to 'epsilon()' could not be resolved/d"
 
-# dealing with bugs in Doxygen 1.9.7 (or earlier)
-# bug description - https://github.com/doxygen/doxygen/issues/8091
-if [ "$(printf '%s\n' "1.9.7" "$doxy_version" | sort -V | head -n1)" = "$doxy_version" ]; then
-     echo "Filtering Doxygen warnings \"Member MantleAPI_ ... is not documented\" (see https://github.com/doxygen/doxygen/issues/8091)"
-     sed -i '/warning: Member MantleAPI_.*is not documented/d' "doc/DoxygenWarningLog.txt"
-fi
 
-# dealing with DOT issues bugs in Doxygen 1.9.7 (or earlier)
 # bug description - https://github.com/doxygen/doxygen/issues/8091
-if [ "$(printf '%s\n' "1.9.7" "$doxy_version" | sort -V | head -n1)" = "$doxy_version" ]; then
-     echo "Filtering Doxygen error: Problems running dot: exit code=2, command='dot' (Doxygen 1.9.7)"
-     sed -i "/error: Problems running dot: exit code=2, command='dot'/d" "doc/DoxygenWarningLog.txt"
-     sed -i "/error: Problems running dot: exit code=2, command='dot.exe'/d" "doc/DoxygenWarningLog.txt"
-     # remove blank lines
-     sed -i '/^\s*$/d' "doc/DoxygenWarningLog.txt"
-fi
+filter "1.9.7" \
+       "Warnings \"Member MantleAPI_ ... is not documented\" (see https://github.com/doxygen/doxygen/issues/8091)" \
+       "/warning: Member MantleAPI_.*is not documented/d"
+filter "1.9.7" \
+       "Error: Problems running dot: exit code=2, command='dot'" \
+       "/error: Problems running dot: exit code=2, command='dot'/d"
+filter "1.9.7" \
+       "Error: Problems running dot: exit code=2, command='dot.exe'" \
+       "/error: Problems running dot: exit code=2, command='dot.exe'/d"
 
 # filtering warnings not related to in-line documentation
 sed -i "/Detected potential recursive class relation/d" "doc/DoxygenWarningLog.txt"
 
+# hotfixing CI (see issue https://gitlab.eclipse.org/eclipse/openpass/mantle-api/-/issues/68)
+sed -i "/error: Problems running gswin32c.exe. Check your installation\!/d" "doc/DoxygenWarningLog.txt"
+
 # remove blank lines
 sed -i '/^\s*$/d' "doc/DoxygenWarningLog.txt"
 
-if [ -s "doc/DoxygenWarningLog.txt" ]
-then
+
+if [ -s "doc/DoxygenWarningLog.txt" ]; then
      echo "ERROR: Doxygen warnings"
      cat "doc/DoxygenWarningLog.txt"
      exit 1
 else
      echo "No Doxygen warnings found"
      exit 0
-fi
\ No newline at end of file
+fi