In the APP 'Mass Changes to Purchase Orders' you add the 'Supplier' field as a selection criteria with a condition 'does not contain'
When you run the APP you are receiving error "Function substringof is not supported"
SAP S/4Hana Cloud - All Versions
Reproducing the Issue
1) Open the APP mass changes to purchase orders.
2) Add the supplier field as a filter
3) In the supplier field add the condition 'does not contain' and then your supplier number
4) Press Go
The 'does not contain' selection parameter is not supported in this context
If selecting based on the Supplier, use the operator 'Not Equal to' instead
LIFNR, F2593, GET_OSQL_WHERE_CLAUSE_CONVERT, CL_SADL_SQL_EXECUTOR, C_PurchaseOrderMassUpdateType, MM_PUR_POMASS_UPDATE_SRV, /IWBEP/IF_MGW_EXPR_VISITOR~PROCESS_UNARY
KBA , MM-FIO-PUR-PO , Fiori UI for Purchase Orders , Problem