change order pending approval quantity less than original purchase order quantity

Summary:

PO change order quantity less than Original purchase order quantity

while the Change order is pending approval PO full quantity is received

So what will happen to this change order after it approved and tolerance is zero how the system will handle this case now the received qty is less than the new ordered qty any advice for this case please ??

Content (please ensure you mask any confidential information):

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

Code Snippet (add any code snippets that support your topic, if applicable):