Asset Clearing SLA

It is my understanding that if the Payables CCID is populated in the Mass Additions table and the FA_Asset_Invoices table, then regardless of the SLA rules, the Assets Additions entry will clear the Payables distribution line.  We have modified the SLA for Clearing for the Addtions event.  It was our expectation that this will only come into play when we manually enter an asset, but when we add an asset from Payables, it uses also use this rule.  We have placed a condition on this rule so that it works as expected.  I am looking for clarification on how it is