same position in differenet org unit

HI Folks,

Is it possible that one same position is available in two different org units with 100% occupation. actaully, I have a situation where an EE is moved to diff. org unit but it is not updating org key automatically generated by combining per area and org unit. Though its working fine for the previous record till the time org unit was not changed but not when the org unit was changed.so, the new record is not updating automatically. where cld be the problem.

Thanks,

Rashmi