500 limit to importing connection

Hi, 

I can only import 500 connections to a connected field.   anybody have same experirence and how to deal with it.  Its a many2one connections.  The field has 718 records but only import 500.   It seems that Knack has trouble giving me an answer and I dont see any logic in this 500 limit.  Any work-arounds?

Best regard.

Joachim