Txt import to MYOB Classic not posting GST correctly

In Essentials

Output GST 821

Input GST 820

In AO Classic codes are the same

Import txt file

Pop up window

Select an Account

Transactions do not add to Zero

Choose an Account

When you select a suspense account and finish the import

Open the batch

Note on SOME transactions

Debit to Accounts Receivable for full Amount E.G 772.69

Credit to Sales for GST Exclusive Amount  E.G  671.90

Nothing in the GST column

It is the total of these erroneous entries that led to the Error and balancing entry in the batch

Ones that are correct show

Debit to Accounts Receivable for full Amount

Credit to Sales for Full Amount

GST portion in GST column

When you look at the Journal portion of the txt file on the entries that are correct you see the GST portion showing next to 821

on the incorrect ones no GST portion

I am stumped.

Have checked invoices

Have checked customer payments

Have checked GST codes in General Ledger Options

Have checked GST in GL Accounts Maintenance on the income code