Hi Jean,
Sorry - you can't. The batch does not store the customer name which is displayed in this field for regular cash. Even if we let you type it in, it wouldn't be stored anywhere.
Can you enter more description with the g/l account distribution?
In the upcoming release of Adagio Receivables, we've added more description space and optional fields to the transactions. This should help you solve your problem.
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Andrew Bates