MDG-C system behaviour

We are enhancing standard code and observed the below issue,

While debugging we observe that for one user id ,class ‘CL_BS_BP_GUIBB_RELATIONS’ is executed first then class CL_BS_BP_GUIBB_RELATIONS is executed,

But for other user id class ‘CL_BS_BP_GUIBB_RELATIONS’ is never executed which makes the enhancement fails.

So should we do some version check for our ID's?

SU53 is also no help

Please provide your inputs.