A Contact record can be made into a Creditor record at any time. Once the link has been made, it cannot be broken. The following example creates a new Creditor. There is a tick box here called “Make Creditor”.
To change the Creditor Account No. untick the field called “LockAccountNo” in System 
System Maintenance Creditor.
Even if the Creditor Account No. has been changed, it will still appear on the Contact record with the original Account No., but it will drill through to the record with the new Account No.
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