MAK: Filter on 2 fields when F4 is used

I am working on a prompt (F4) functionality.

I need to display filter on Order Number and Remark as well.

The keys of the customized index MGHEADZ1 that I am creating are:

MGCONO
MGTRTP
MGWHLO
MGTWLO
MGTWSL
MGTRNR
MGREMK
Condition: MGTRSL <=44 [As I need to display orders having status <=44]

Here, the values for first 5 keys I am getting from screen and hence no issues.

MGTRNR is Order Number (Also a key field of MGHEAD) and MGREMK is Remark.

I have couple of queries on this

1) Is the key sequence correct especially sequence of MGTRNR and MGREMK. [Remark can only exists if DO is present]

2) Need an existing example from M3 where more than one filtrations are used as a reference

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If the only thing you want to do is create a Pop-Up with some filter(s) in place, why not use a Script instead to avoid a MAK Modification?

This prompt is part of a bigger MAK change. Rest all things are done, just this part is pending. Also, I am not very much accustomed with scripting.