If you define either of these relationships:
EuSanctions::Name_First = PaymentsOut::Name_First AND
EuSanctions::Name_Last = PaymentsOut::Name_Last
EuSanctions::cFull_Name = PaymentsOut::Beneficiary_Name
Then your conditional format expression can be:
IsEmpty ( EuSanctions::Name_Last ) //use any field in EuSanctions that is never empty.
A conditional format expression can be used to make layout text appear/disappear. You may need to create a new table occurrence of EuSanctions for this relationship if you have already defined a different relationship between the two tables. If you do, use that name of that new occurrence in this expression.
Some of the fields are empty... however your advice has guided me to find the IsValid function. And once applied correctly, which I wasnt doing I now found out