How to extract Registration Number on OTBI?

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Hi

I've used the mapping tables for R11 but cannot seem to find the 'Registration Number' under Registration Details (For Suppliers). What I do get back is 'First-Party Tax Registration Number' and 'Supplier Tax Registration Number'. However, both options return no results. I have attached a screenshot of what we need to extract below. I know that the Registration number in the image is blank, but we are under the impression that it should just return a null value (rather which it just produces an error in the report).