How to check if Postprocessing is enabled in Master Data?

Note: Below is only applicable to "Master Data", not "Transactional Data" (e.g. for already created Purchase Orders)!

1.
For all subcontractors
The "Postprocessing flag" must be set to "Required" in the tab "Classification" in the Material Master (accessible via SAP transaction MM03).
Example:


2. Only for subcontractor "Page"
The operation "PRGTST-S" with Control key "YBP4" must be set in the Routing (accessible via SAP transaction CA03).
Example:
Creation date: 26/04/2021 11:08      Updated: 26/04/2021 11:10
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