If you want to remove the attachment of a prepayment from a job or a layaway and you do not want to attach that prepayment to another job or layaway follow the below instructions.
From the BusinessMind home page click the Sales link
From the View Invoices area search for the prepayment you need to modify. Then select it to bring up the prepayments detail view.
From the prepayments detail view click the edit icon to enter edit mode.
Now you can click on the gear icon and choose the Remove Prepayments Target option which will remove the connection from the prepayment to the layaway or job it is connected to. After this be sure to click the Save icon.
For instructions on how to reassign a prepayment towards a different job or layaway click on the link. http://docs.bmjapp.help/en/articles/3369983-how-to-reassign-a-prepayment-that-is-already-assigned-to-a-job-or-layaway