No authorization for entering the signature: Entry rejected

What causes this issue?

You do not have the authorization required for entering the current
signature.
The system does not accept the signature.

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?

INCLUDE 'NA_BER' OBJECT DOKU ID TX LANGUAGE EN

Procedure for System Administrators

Check the user authorizations in Customizing for <LS>Process Management
</>. The user requires authorization for:
Transaction: ,,<LS>CO58</> Maintain PI Sheet
Authorization object:,,<LS>C_CRPI_BER</> PI Sheet
The authorization required for entering the signature is specified in
the corresponding data request. If you display the data request in the
process instruction assistant, you will find the authorization required
in step 5 for the <LS>Signature</> characteristic. The
<LS>Authorization</> field specifies the activity for which the user
must be authorized.

Error message extract from SAP system. Copyright SAP SE.