Gaps (holes) in the numbering schemes
Although it should not normally occur, it may happen that a number of invoices remain unallocated.
If you have for example the * INV-XXXX * numbering scheme, from which the invoices * INV-0001 *, * INV-0002 *, * INV-0003 * but missing the invoice * INV-0184 *.
To be able to automatically detect all these gaps (holes) in the numbering scheme, there is a check function exemplified in the graph below.