2134873 - FM Commitment update in Services: Partial SES, Invoice excess amount and Availability Control Errors

You are using Funds Management with customizing set to "GR/IR Update = GR and Inv." in FM customizing activity "Make Other Settings" (transaction OFUP).
For Service Purchase Orders, you are using an Unit of Measure that is set as Value-based in transaction CUNI as recommended by SAP.
You post partial SES.
You post (some) Invoice receipts larger than corresponding SES.
At the time of posting a new partial SES, processing is stopped by Availability Control error message in Funds Management, even though the PO open amount is sufficient to support the new partial SES

 Note: Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental.

FMAVC005, BP629, ML81N, value-based, excess amount, KBA, FMAVC008, MIRO, SES, Partial, Budget Exceeded, Service Entry Sheet, excessive , KBA , PSM-FM-BCS-AC , Availability Control , PSM-FM-UP-CM , Commitments , PSM-FM-BU-AC , Availability Control , MM-SRV-GF-CO , Commitment , Problem