Amount &V1& cannot be converted to internal format.

What causes this issue?

The amount &V1& could not be converted from external format to the
internal format.

System Response

Processing is terminated.

How to fix this error?

If you are using your own data selection program, make sure that the
amounts are transferred in the correct external BAPI format. If you are
using an SAP program for data selection, contact the SAP Hotline.

Error message extract from SAP system. Copyright SAP SE.