SAP Message TT751 - Function could not be performed; test tool error code: &

Diagnosis
The error message can have the following causes:
1. the external test tool is not correctly installed.
2. the SAP CATT application interface customizing parameters are notcorrectly setup.
3. an external test tool error with the specified error code.

Procedure
Install the external test tool and setup the external test tool SAPCATT application interface customizing parameters correctly.
Read the external test tool documentation for the specified error code.