So, that issue is for now sorted out.
I did add multiple currencies for the package(s). And that prices in there, where returned. They don't update in relation to the main currency.
As for this, I really suggest, to apply massive changes to IMPORT MANAGER - WHMCS. Apert from customers, invoices+, module settings, all other imports are unusable and ideally should be skipped.
It's a pain in the lower backside, disabling hundreds of services, which can't be deleted or adjusted.
All packages must be new build
Thx to Blesta Addons, I am now again a little further
Tiny