SAP Message B0253 - Personnel number & is not numerical

Diagnosis
You have selected the fields 'HR Org. Link' and 'Employee' in thebusiness partner occupation data.
The system checks whether the personnel number &V1& you have enteredexists in HR.
The personnel number must be 8 digits long and contain numbers only.

System Response
The personnel number &V1& you have entered contains non-numericcharacters.

Procedure
Enter an 8 digit numeric value.