Item category assignment for GL account

Hi,

You have been helping me a lot with lots of issue.

I am having another issue that is, I can't add an Item category 04000-cash account in Financial accounting (new)---GL accounting (new) ------ Business transaction ----- Document splitting -------Extended Document splitting ------ Define Business Transaction Variants

Here I can't save Item category 04000.

Can anyone help please.

Thanks

Sonia