JPMorgan Chase has provided very specific instructions for the ACH Setup.

ACH Setup must all capital letters and no punctuation.  It is best to use all capitals on vendor names, employee names, and customer names as well.

EACH 6 RECORD (transaction) must reflect an alpha-numeric ID number for that employee/vendor/customer.  This will come over from the 'Account No.' field in QuickBooks' Profiles, or it should be a mapped column in an Excel or CSV import.

(Skip Screen 4 and go to Screen 5 -- Chase does not want balanced files (offset records).)

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The ID Number field must be populated on a JPMorgan Chase ACH file, and if you are not currently using ID numbers (i.e., 'account numbers' on Profiles, under 'Additional Info') in QuickBooks, you can set the system to create a constant ID that will be included on the file.  [Note:  The ID alpha characters must be all capitals.] 

To set this default in QuickBooks, from the Integration box, click on Settings->ACH Settings->Other Settings--and select 'Constant' in the dropdown [see below].  Then 'Save.'

Then, be sure to go into the ACH Setup, click through the Advanced Setup options to Screen 7, and under Advanced->'Legacy 3 and QuickBooks' tab, enter the constant to be included in the ID Number field--in all capital letters [up to 15 characters].

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See actual specifications below: