How to set approval rule to check invoice total amount excluding tax for debit or credit memo

Hello,

We have requirement to set invoice approval by thresholds based on invoice total amount excluding tax. We set a rule to check the invoice total amount for all invoice types including standard invoice, debit memo and credit memo. Originally we only apply an absolute condition to invoice total amount (considering negative sign in credit memo and debit memo), and it works fine. However, after adding a condition to check only the item line type to exclude tax amount, the invoice was not assigned to anyone and just stopped after initiating approval. Seems there is conflict in the rule conditions. Is