Business Central Dataverse Synch Error Customer Table

hi, after the endless struggle with the data verse synchronization and the enums with the paymenttermscode and the values, I am faced with a new Problem in the customer table, and I really cannot explain the error to myself.

In English: An error occurred while communicating with Dataverse.
What he means with the value 20? And what is that for range 2,5,7 and 8? see picture

Can you help me?

Kind regards