Retaining formula when row is deleted

I am using Numbers version 3.6.2 and El Capitan

I want to have a formula on one sheet (call it MARK) to access a cell (B2) on a different sheet call it CSV. This I can do.

I then want to print the sheet called Mark. This I can do.

The Problem

I now want to repeat the exercise but in order to get my next result I want to delete row 2 in CSV so that the new row 2 has the data I want in Mark. As soon as I delete the row in CSV I have an Invalid reference showing on MARK

I have tried with the spreadsheets in the cloud and local but I get the same result.

I have tried both of the references below.

CSV::B2

CSV::$B$2

Can somebody tell me what I am doing wrong or give me another way round the problem. I have looked at Automator and Applescript however they seem a little too complex for me.

Any help would be appreciated.