2809250 - Error Message Grouping XXXX has external number assignment, enter a number encountered in Supplier Migration

While performing the migration for supplier below error occurs:

"Grouping xxxx has external number assignment, enter a number"

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

SAP S/4HANA Cloud

1. Choose option "Migrate your Data" in app "Manage your solution".
2. Go to the relevant migration project.
3. Select the Migration object "Supplier".
4. Upload the migration template and then click on Activate.
5. Click on Start transfer.
6. Perform the Validation phase followed by the Convert Values phase.
7. Then Simulation phase.

Incorrect mapping of parameter "Vendor internal or external Numbering" in the convert value phase

When using external grouping and number range,  it is required to map the parameter "Vendor internal or external Numbering" to "External numbering" in the Convert value phase of the migration process.

2787414 - Error R1091: Migration of Customer

R1091, migrate your data, supplier, Grouping xxxx has external number assignment, enter a number, The business partner needs a key to identify it, This key was not specified, supplier migration, LTMC, migration cockpit, migration template, S/4HANA cloud, S4_PC, CA-GTF-MIG, external grouping, internal grouping, BP, external number assignment. , KBA , CA-GTF-MIG , SAP S/4HANA Data Migration Cockpit Content (LTMC) , LO-MD-BP , Business Partners , Problem