spend money save transaction failed error account SYsld can not be null

Hi all,

I hope someone can help! I have had this issue now for the last two weeks and cannot enter any data in the Spend Money section. The errorr message I get is : Save Transaction Failed Error AccountSysId can not be NULL.

I have tried all other things suggested here. Different web browsers, Checked account openg date...

I hope someone can help....I am way behind in book work now and really dont have much time to play around with this  (2 kids at home).

Thanks heaps ...fingers crossed

Isabel