The reason why this or similar orders got rejected by NetSuite
It seems that in this Shopify order this "_____" field contains more characters than the allowance of NetSuite, as a result, our app couldn't sync it to NetSuite.
Example:
[Code=EXCEEDED_MAX_FIELD_LENGTH] The field lastname contained more than the maximum number (32) of characters allowed.
In the above example, this "lastname" field of this Shopify order contains more than 32 characters (including spaces) as a result, this order got rejected by NetSuite.