How works Gapless invoice numbering option in the Manage Common Options for Payables and Procurement

Summary:

If the "Gapless invoice numbering" option in the "Manage Common Options for Payables and Procurement" is disabled and Document sequence for AP Invoice is gapless, which is enforced?

Content (required):

Question1: If the following setup, can we delete the invoice which created by pay on receipt ? (A gapped invoice can be created.)

- "Gapless invoice numbering" option in the "Manage Common Options for Payables and Procurement" : Unchecked

- Document Sequence for AP Inovice : Gapless

Question2: Is the document sequence of the invoice created by Pay on Receipt different from the document sequence of the invoice created by AP?

Version (include the version you are using, if applicable):