SAP Message AO195 - Approp. request &1 already exists - enter a different number

Diagnosis You want to give the appropriation request the number &V1&. However,the number &V1& is already assigned. System Response The system cannot assign the number, since appropriation request &V1&was already created as an external number without formatting for acoding mask. Procedure Assign a different external display for appropriation request numberV1.