How to set up Receivable account with priority rule set

Summary:

I created Auto Accounting Rule and set the Account type Receivable following Customer Site Reference Account.
However, for newly added customer, sometime I forgot to maintain Reference Account at Customer master, 
then when I make SO ➝AR then post to ledger, it will be error.
To make sure that error will not happen, is there any method that I could set up Receivable account with priority rule set?
For example:

priority 1: Receivable account follow Customer Site Reference Account (Auto accounting rule)
                   

priority 2: constant: 11001001 (if  Reference Account  is blank)

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):