Problem with BAdI implementation in the transformation file

Hello experts,

I am working on BPC NW 10.1. The components are BW 740 SP 15 and BPC 810 SP 10. In the EPM, version 10.0 SP 25.

I have a new requirement for the Cash Flow model. When I upload transactional data from a infocube to BPC cube (cash flow model), I need that CATEGORY will be equal to TIME, adding a prefix "CF_". For instance, if the record has TIME = 2016.01, the CATEGORY has to be CF_2016.01.

To achieve this, an implementation badi was created.

My problem is that I can not use this implementation badi, called ZTAU_CATEGORY, in the transformation file. I have used the parameters STARTROUTINE and ENDROUTINE, as help SAP says, but I get this error:

The implementation BAdI ZTAU_CATEGORY is activated. I have been able to use this badi into an script (package), so I know that works.

Why it does not work here in the transformation file?

I would appreciate some help.

Kind regards,

Manu