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TGIF! I’ve create a Suitelet and add a link in Customer Center.
The `GET` work as expect, showing fields, information and submit button.
BUT `POST` works weird…Everything works(update record) but when I try to create an exactly same form like what `GET` does, it showing `UNEXPECTED_ERROR` error. Any idea are welcome…

Otherwise, I'd recommend what I call "elimination debugging" to identify where the UNEXPECTED ERROR is coming from. Essentially comment out most of your post function... then if it doesn't have the error, add back in small chunks at a time until the error comes back. Then you'll know which chunk is causing the error

<@UJ4LB5KU4> Thanks, I found out if I actually create a contact and login to Customer Center works expect, but if I login customer through Customer &gt; Access &gt; Login as Customer will have that issue.