Department & is not available

What causes this issue?

The input values must be stored in table TSAB but value "&" has not
been entered in the table.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Check whether your entry is correct. If necessary, inform your system
administrator so that the entry can be copied into the table.

Error message extract from SAP system. Copyright SAP SE.