Validation using field exit

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In transaction ob28 (change validation) i got tyhe next validation which is in COMPLETE DOCUMENT.

Prerequesite

( SYST-TCODE = 'F-58' OR SYST-TCODE = 'FBZ4' ) AND

BSEG-LIFNR = '999109'

Check

U105 (this is the name for my user exit)

Message

****Note: BSEG-LIFNR is the vendor.

-

In the user exit form i have this code

FORM U105 USING bool_data TYPE gb002_015

CHANGING b_result.

break CCCRZQ.

B_RESULT = B_FALSE.

Has account 11119991 has been used?

LOOP AT BOOL_DATA-BSEG INTO BSEG

WHERE HKONT = '0011119991'.

B_RESULT = B_TRUE.

EXIT.

ENDLOOP.

ENDFORM.

-***** iam trying to use this user exit to check if in one of the lines in bseg table (when i´m generating the document) has the account(hkont) ='0011119991'

1.- Do u know why the breakpoint is not working in the form whats wrong whe i ran f-58?

2.- The user exit entered in check setion is fine or do i need something else?.

Regards.