Cannot modify value in a field populated with an edit method

Hello All

I have used a edit method to display data from a field to another field in a grid. Please see screenshot

Please find a screenshot of the edit method I wrote below

I can modify the field memo, but when leaving the field Memo, it refreshing the Memo field with the Product Name field value.

I need to be able to modify the field Memo value.

Can anyone help on this issue.

Thanks

Regards

Tabrez