backend service (PA-AS)
Example: HR Administrative Services (PA-AS)
Standard service that provides the business processing logic (business
logic) with which the form fields of a form scenario are processed.At the same time, several backend services can be assigned to a form
scenario and the calling of these backend services is specified by a sequence number.
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Source: https://help.sap.com/doc/saphelp_glossary/latest/en-US/43/7087c08233318fe10000000a1553ed/content.htm