Hello Dears,
Scenario of my issue:
1. I've created a sales order then made a line with an item which has taxes on it.
2. Then I've adjusted the tax amount Overriding the calculated sales tax.
3. Invoiced the sales order.
4. Created a new sales order then made a credit note.
"Let's think that sales order created by mistake so I want to delete it".
5. Tried to delete the sales order this error message appeared "Sales order: N-00047956 Item number: 20110911N Remove adjustment of sales tax amount" and refusing to delete.
That's all