In openpdf-core/src/main/java/org/openpdf/text/pdf/Barcode128.java is wrong length value for AI(11).

Line 247 ais.put(11, 9);

the correct value is 8, then ais.put(11, 8);

This is using for GS1-128 code specification.
AI (11) = Production date, format YYMMDD (6 digits)
→ should be correct: 2 (AI) + 6 (data) = 8
like AI length for 12-17

Documentation GS1 code here on page 155.