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Each step consists of the following sections : Callup points consist of 3 points such as :Įach validation consists of one or several steps that are executed in succession. Validation can be triggered at various callup points, usually this happen during the check for the document at header or the document item takes place. SAP Validation and Substitution – Callup Points

Each step in turn consists of prerequisite, a check and a message displayed if check fails. A validation for a specific callup point is therefore created and contains one or several steps. You can use SAP validation to check an accounting document and to reject the posting, You can create validation in transaction OB28. Therefore you can implement a central set of rules in validation that will always run regardless of whether the original document is material document, a logistics incoming invoice or a document from another SAP module. However the advantage of validation and substitution is that there is a central item in the interface between MM and FI. Of course, you also have the option in many MM enhancements to check an input or overwrite field contents. With substitution, you can overwrite some field contents of the accounting document. With validation, you can check the field contents of the accounting document and prevent the posting of a document if required by displaying an error message.

The difference between the two is as follows: With SAP validation and substitution, you have two very similar tools provided. In this article we will discuss about Validation and Substitution in SAP Accounting Documents, Perhaps you are wondering why we discuss validation and substitution in SAP Financial ( SAP FI ) the answer is that numerous MM Documents have an FI document as a follow-on.