Answer / santhosh

Validation is the Functionality used in SAP to restrict users from an action and throws an error, it acts as a watch dog and validate the data whenever a posting happen.
It can be used to restrict in various ways based on our selected criteria.
Tcode-GGB0
There are three ways validation can be done.
1. document header level
2. Line item level
3. Complete Document

Ex:-
1. if we want to restrict user from Posting amount not more than 1000000
2. we can restrict them from inputting data in certain fields.
Steps to create Validation
1. Prerequisites - Prerequisite we give the condition on which the logic should work.
2. Check- Here we give the logic which should be checked while posting
3. Message - Here we give the message what should be displayed when throwing an error.

Substitution(TC-GGB1)

Substitution is a process to auto substitute constant value in a specific field.

for exam- if your making a posting and the profit centre should be used is Profit center A if its given as Profit center B system automatically changes to the correct one which can be seen after the posting.

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