@mg2017 placing the parent customer on hold does not place the children on hold. that way your issue is only with the parent the children could continue to order and transact with you. Think of multi-subsidiary entities that may do business with a company and operate fairly independently, but may have bills paid through a parent entity. You could accomplish the hold of children through a scheduled workflow running every 15 minutes or a scripted solution that would be instant

looks like it doesn't put the child on hold, however, because the parent has open invoices and above their credit limit, this impacts child records even though they are not on hold creating an order for the child throws credit limit error.