Using the Migration Cockpit (APP Migrate your Data) you would like to create Purchase Orders with an external number range but the system always uses the internal number range assigned to the Purchase Order document type.
SAP S/4Hana Cloud - All Versions
Reproducing the Issue
Open the App “Migrate Your Data”.
Choose or create a new migration project
Choose the migration object “Purchase Order (Only Open PO)”.
Upload the desired file, confirm the mapping and 'Simulate.
In the migration tool the default numbering is internal.
If you want to use the external numbering defined in your upload file, you have to choose external numbering specifically in the migration tool, via Control Parameter 'Purchase Orders, internal or external numbering (00002)
*Note: Even if you intend to use external numbering only for migrated purchase orders, you must define both an internal and external number range for the document type involved if it is not a standard PO type.
BAPI_PO_CREATE1, exs_poheader-ebeln, FMMEXE01_PRUEFEN_NUMMER, MAP2I_BAPIHEADER_TO_HEADER, ekko-ebeln, NUMBER_CHECK, t161-numke
KBA , MM-PUR-PO-BAPI , BAPIs - Purchase order , CA-GTF-MIG , SAP S/4HANA Data Migration Cockpit Content (LTMC) , How To