The cause is a functional module called HR_GET_QUOTA_DATA which gets parameters from the BADI-CL_PT_ARQ_REQ.
Please check the class- CL_PT_ARQ_REQ_EXIT, it will contain the method-
IF_EX_PT_ABS_REQ~GET_MOD_AND_QTYPE.
Here, When the parameter MOD=B or C then it gets quota data from the time clusters.
Set MOD=D in the BADI and that way it gets data from IT2006.
I am attaching the screen shot of the method where you will have to make the MOD to D.
Thanks & Regards,
Sujit Kumar Karn