Solution : https://service.sap.com/sap/support/notes/682528 (SAP Service marketplace login required)
Key words :
menu path 'production -> sales & operations planning, choose entry 'maintain checking groups, system displays error message ', maintain checking groups, -> master data -> assignment, availability check reason, missing entry, checking group, solution maintain, availability check
Related Notes :
| 814673 | MC84: How to identify required fields (MG 144) |