FA purchase from PO Error Message

I want to purchase FA from Purchase Order. However, I always get an error message that “Gen. Prod. Posting Group must have a value in G/L Account No.=1624-00. It cannot be zero or empty.” Does anyone know how to fix this error because i think I have set up the G/L account code in Gen Prod Posting Group. I dont know what is the problem. Thank you so much!!!

Go to G/L Account card of G/L Account No.=1624-00. On the 2nd tab (Posting Tab) specify the value of "Gen. Prod. Posting Group"