SAP Message VL421 - Serial number profile is missing for material & in plant &

Diagnosis
No serial number profile has beenmaintained for material &V1& in plant &V2&.

System Response
The system does not allow you to maintain serial numbers for this item.

Procedure
If you want to maintain serial numbers for thisitem, either enter a plant for the item, in which a serial numberprofile already exists for material &V1& or maintain a serial numberprofile for plant &V2& in the plant data of the material master record.
IF &[SWITCH]AD_SUB_SFWS_01& = 'X'.
INCLUDE ADSUB_ASN_SN OBJECT DOKU ID TX
ENDIF.