prohibit po change when line has been matched

Summary:

how to prevent PO change / PO edit when one of the PO line has been matched to an Invoice?

Content (please ensure you mask any confidential information):

example, PO has 3 lines
line 1 has been matched to AP Invoice
line 2 and line 3 still not

since line 1 has been matched to AP Invoice, user wants this PO cannot be edited / amount cannot be changed

how to achieve this requirements?

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

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