Need an Expression Rule

Hi,

We have a year data from Dec 2019 to Dec 2020 total 13 months data is available in DB. Need an expression rule based on the Date field  we need to display the 13 months data in a Grid. Previous four months data  should be in readonly and current four months data should be in editable.

Example (1) :

If  selected the Date is 1st March 2020  then data should be displayed from  Dec 2019 to  Dec 2020.

Dec 2019 to March 2020 should be display in readOnly  and  April 2020 to Dec 2020 should be displayed in editable.

Example (2) :

If  selected the Date is 1st May 2020  then data should be displayed from  Dec 2019 to Dec 2020.

Jan 2020 to April 2020 should be display in readOnly  and  May 2020 to Dec 2020 should be displayed in editable.

Here, if user goes and edit on current month then previous four months should be readOnly and after current month, all months should be displayed in editable.

Your earliest response will be appreciated !

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