Unassociated Credit Memo in AR doesn't populate form to enter Distributions

we have created a new Operating Unit in AR and working as expected with 1 exception.  We can't create a manual unassociated Credit Memo.  The Distribution form doesn't populate to allow us to enter the appropriate GL Account.  Works in all other Operating Unit.

In the transaction form (transactions > transactions ) we select:

Source:  Manual, Class:  Credit Memo Type:  Specific CM we defined for unassociated CM

We enter the Customer and the select the Line Items button where we add a description and Amount (e.g. -5).  Next we select the Distributions Button  and get the blank form.

We did compare AR setups to other OUs where the form populates as expected  and couldn't find any specific difference to pint to root cause