tax account allocation to profit centers in document splitting

dear all ,

i have a problem when trying to post eh following entry in cash journal

DR EXP ==> COST CENTER XX ==> PROFIT CENTER 1000

DR TAX ACCOUNT (NO PROFIT CENTER COULD BE DETERMINED )

CR CASH ==> PROFIT CENTER 1300

when i remove the tax code from the cash journal business transaction the document posted..

the tax account is assigned to item category in 05100 in document splitting

regards