Ok, two part answer to the solution. Yes, 🙂 It did work, thank you, thank you, thank you!
But, I had to revert back to the default configuration – it puts a zero in the custom field, so a user cannot just start typing as the result is for example: 0,200,000 instead of 200,000.
Also, the zero cannot be deleted.
I think it's just something small that can be sorted out – 🙂
Let me know.