What conditions invoke a rule with the condition 'PO Charge Account Modified Equals Yes'

Summary:

We need clarification as to why the condition 'PO Charge Account Modified Equals Yes' seems to be invoked when there's a schedule split.

Content (required):

See attached for case where schedule split invokes a rule with the condition 'PO Charge Account Modified Equals Yes'.

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

22D (11.13.22.10.0)

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