Parse-error with 'BLANK (WHEN) ZERO' clause in SCREEN SECTION. (AcuCobol)

We are trying to parse Cobol sources.

Having a ‘BLANK (WHEN) ZERO’ clause in a SCREEN section causes the parser to fail, while the compiler has no problems with it.

Versions used:
Cobol: AcuCobol version 10.2.1, fixed format
SonarQube: Enterprise Edition Version 9.6.1 (build 59531)

– extract from the parser logging –

ERROR: Unable to parse COBOL source file : /build/builds/_NwxSV3v/0/dataserver-utilities/tdeltaplayground/sonar-parse-errors/cobol-src/source/PP0026 at line 8

Original contents starting from line 1 till line 10:
       IDENTIFICATION DIVISION.
       PROGRAM-ID. PP0026.
       WORKING-STORAGE SECTION.
       01  VARIABLE PIC 9.
       SCREEN SECTION.
       01  DEMO-SCREEN.
      *    Using the 'BLANK (WHEN) ZERO' clause causes a parsing error:
           03 USING VARIABLE COL + 2 BLANK ZERO.
       PROCEDURE DIVISION.
           GOBACK.


Preprocessed contents: 
Parse error at line 8:

    1:  IDENTIFICATION DIVISION .
    2:  PROGRAM-ID . PP0026 .
    3:  WORKING-STORAGE SECTION .
    4:  01 VARIABLE PIC 9 .
    5:  SCREEN SECTION .
    6:  01 DEMO-SCREEN .
    8:  03 USING VARIABLE COL + 2 BLANK ZERO .
                                            ^
    9:  PROCEDURE DIVISION .
   10:  GOBACK .
   11:  EOF

Please fix this parse-error

Thank you for your feedback.
Ticket created: SONARCOBOL-1655