Syncronize in Form does not work. New field is not imported into fieldlist and remains in synchronize list as a new field

Hello,
in my form I want to synchronize my MYSQL-Table. The new field kundengruppe_Ref is shown in the list as a new field. After synchronize this field is still there and is not imported in the fieldlist. Any idea what’s going wrong here ?

Thanks
Uwe

I found the solution. I used SQL-Builder and refreshed my connection to synchronize all tables. After that the form synchronization worked …