SLED in MIGO

In MIGO under Batch tabstrip, there are 2 fields - Date of Manufacture, and SLED

I would like to make them free fields if no dates are maintained for batch, user should be able to enter any value they like. How can we do this. Currently the Mfg date and Expiration Date default from the batch master. If the user enters any value, it gets overridden.

Thank you.

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Message was edited by: Jürgen L