You can use additional validation to supplement the existing SAP logic to fit you into your businness needs.

For e.g. to allow postings from company code 0001 to business area AA only.

GGB0 - To maintain the validations

Validation - Enter a validation name  e.g.  VBUS

Applicaion Area - SAP module e.g. FI

Calling Point - Dependent upon the application area that is selected.

0001 - Document Header - validate enteries at document header, e.g BKPF table

0002 - Line Items - check line item entris within a document, e.g. BSEG table

0003 - Complete Document - check settings for the whole documents.

Prerequisite
<BSEG> $BUKRS = '0001' AND
<BKPF> $GLVOR = 'FI00'

Check
<BSEG> $GSBER = 'AA'

Message
Type E   No. 14 - Business Area not allowed for company 0001
Output fields  1 - BSEG - GSBER      2 - BSEG - BUKRS
                     3 -                                 4

OB28 - Define Validations for Posting

CC     CallPnt   Validation    Description                        Activtn Level
0001      2          VBUS           Business Area Validation              1

Activtn Level - 0 - Not Active    1 - Activated     2 - Activated for all except batch input

GGB4 - Manage the activation of all validations in the SAP system.

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SAP Financial and Controlling Interview Questions, Certification and Configuration, Books

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