Software: MoneyWorks accounting software
You need to setup the preferences in order to allow MoneyWorks prompted you when a duplicated Purchase Invoice was recorded.
From MoneyWorks Document Preferences, Terms tab, you need to select the Check Box for “Check for Dup. Creditor Invoice Numbers”. Once this check box is being checked, whenever you try to save a Purchase Invoice which was duplicated, a warning message will be popped up:
“There is already a transaction of this type with the same reference number. What do you want to do?”
You have an option of “Leave it as is” or “Go back and enter a new one”.