Sage Accounting Canada

How can I mark a $0 Sales Invoice as paid? I had to create this invoice to make a line-item adjustment (items were same price) so my invoice comes to $0.00 and is now marked as outstanding and I want to clear it from 'awaiting payment'.

I've migrated from Sage 50.

How do I accept a payment for an 'old' invoice created before the migration date?

I can see only invoice created in the Sage Cloud.

I have changed the date to before the original invoice was created before the migration…