Income not showing in BAS

Glad to have you here in the Community, why_keep_changing! 

The G1 amount is summed up from the total GST of all Sales transactions that have GST as part of the transaction. If the income is not showing at G1 in BAS, you will have to find the transaction that is missing and include GST into them and make sure that the date of the transaction is within the period of the BAS you would like to lodge. 

For your reference, you can also check on this article: What to do when BAS amounts look incorrect.

Feel free to drop a comment below if you require further assistance. Have a great day!