No administration authorization for TREX

What causes this issue?

No administration authorization for TREX.
User does not have sufficient administration authorization for the TREX
administration. For this action you require at least the authorization
for value &V1& of the authorization object S_TREX_ADM (field ACTVT).
The role SAP_BC_TREX_ADMIN contains the necessary authorizations.

System Response

The function terminates.

How to fix this error?

Obtain the necessary authorizations, or contact colleagues with
sufficient authorization.

Procedure for System Administrators

Refer to note 766516.

Error message extract from SAP system. Copyright SAP SE.