SAP ISU FICA DOCUMENT POSTING ERROR

Hi Experts

I posting a document in SAP ISU FICA. (Tcode FPE1) Main transaction is 0600 and sub transaction is 0010. but i am getting error i.e

account determination is not possible for key comp code//01/0600/0010

account determination is not possible for key comp code///0600

G/L dost not exit

please help

Regards

Rehan