Functonal area in Goods Receipt

hi,

there are 2 material document numbers(Goods receipt), same cost center , g/l account, profit center , business area only difference is 2 different plants for same company code . there is difference in functional area for 2 material documents . we have maintained account assignment 'K' in Purchase order. for both the mat doc , Functional area should be same. Please guide me on this.

Regards,

Sowmya