Regarding Integration Model to CIF from ECC to APO

Hi ,

Please assist me in the following issues:

1. What will the impact if any material is ciffed twice or multiple times from ECC to APO through IM ...will it generate inconsistency ? if so, how we can avoid this ?
2. While I'm ciffing the material from ECC to APO through IM, the ' Find Master Data Object ' is showing certain number say 'X' but when I'm running CTM for it the explosion of BOM  of Master Data is showing less number of material than 'X'...in that case what might be the possible issue ?
3. While generating IM , can I club Sale Order, Sale Order Stock, Planned Order, Prodn order under same variant ? or ill it generate inconsistency ?

TIA

-Michael