K-1 Box 8c, 9, and 15

Have amount in box 8c (unrecaptured 1250 gain) and amount in 9 (net section 1231 gain).  When I get to the entry part for K-1, the program asks me to enter the dollar amount from box 15, code b attributable to the 1250 gain and the 1231 gain, but only one number is in box 15, code b.  Should I enter this number (box 15, code b) as adjustments for both the 1231 and 1250 gain? Or should it be split up, and if so, how do I determine the amount attributable to each gain (the 1250 and 1231 gains)?