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is there a limit to the number of custom fields that can be added to a record. I read that Oracle tables can have up to 1000 columns, which i assume includes native fields

If you are using that many fields - I'd suggest you are probably using something in an unwise fashion

I.e. you are using multiple fields for something that should be a subrecord

I’ve tested this out as I had the same question and NS Support wasn’t able to answer it.  I pushed a custom record past 1000 fields and it did not break.