Conditional Logic on Page Calculated Fields?

You can use the ternary syntax (The expression verifier in Simple Object Designer doesn’t understand it, but done currently, it will work on BC25+)

https://learn.microsoft.com/en-us/dynamics365/release-plan/2024wave2/smb/dynamics365-business-central/use-ternary-operator-when-coding-al-language

Something like:

a= ‘XYV ? 0 : Rec.”Cost Amount”