How to calculate Credit Limit and Aging Hold on child customer?

Hi there,

I understand if an order is entered under the credit limit amount but the aging percent is over the order will go on hold. Or if an order is entered and the Aging percent is under but the credit limit is over, then system will put the order on hold.

We are have an issue for a child customer only - the aging percent is over but the credit limit amount is under, but the sales order didn’t put on hold. I am not sure whether it is because this customer has parent/child relationship. 

Please see attached screen shots. The customer is 1555664 and its parent is 1555375. The child and parent ‘Credit Check Level’ are setup to ‘P’ at parent level, so when calculate Credit Limit and Aging Hold, it should be group whole parent and child together. However for #1555664 customer order, it