FI number range - fiscal year dependent

Hi

we are using fiscal year variant K4 which is having year dependent number range.

but we are getting document in sequence whether posted for 2009 or 2010. for example when we are posting vendor docuemnt with doc type KR for 2010 getting number 100 (for example) and next document posting with same document type for fiscal year 2009 getting 101.

can anybody revet with cause of problem and solution in detail. we have check all possible configuration but could not able to make out.

regards

DD