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

FMAVC005, BP629, ML81N, value-based, excess amount, KBA, FMAVC008, MIRO , KBA , PSM-FM-BCS-AC , Availability Control , PSM-FM-UP-CM , Commitments , PSM-FM-BU-AC , Availability Control , MM-SRV-GF-CO , Commitment , Problem