This modification consinsts of two parts.
- The same Document number can be used in a different project or even in the same project - but only with different Supplier. The system should just block the combination of a Supplier+Document number within one project.
- Can the same number be used within one project on two different suppliers? - YES
- When the user tries to add already entered Document number, the system should write following error message:
"Cannot save the expense, selected Supplier + Document number is already entered."