asset accounting acccount determination AO90

Hi

T.code AO90

when i am trying to assing GL account under account determination balance sheet accounts it's throwing the following error:

Gl xxxxxxxxxx is not a balance sheet account

GL xxxxxxxxxx not allowed to be PL account

(in master data of the GL shall i make it to Balance sheet,

what about the second error "not a PL account")

how to rectify this error

useful answers will be rewarded with points

regards

prasad