Customer request for vendor key for wfm during SAP upgrade or migration.
All WFM versions , SAP HANA upgrade.
SAP stops providing vendor keys for abap add-on manufacturers as per attached sapnote.
We should recommend customer to un-install WFM before SAP upgrade and re-install WFM after SAP upgrade.
In case customer having any issues while un-installing WFM or any concerns then customer should contact Winshuttle support.