Active BADI not getting triggered in QA system

Hi Folks,

            I have implemented the BADI 'ACC_DOCUMENT' in DEV to withhold tax while posting documents. Its working fine DEV and have moved the same to different client for testing (QA). But there the BADI not getting triggered.

           In QA SE19,  its mentioned as 'The implementation will not be called'  at the 'Runtime behavior' field. Could any body explain what does it mean and why it is able to get triggered in QA.

          I just checked.There is another implementation for the same BADI via Enhancement Implementation. Is this the reason for this behavior. Please                suggest.

                      Thanks in advance,

                           Shyam.