Execute user function per row or group

Hi,

I have a table with dates and I would like to add a new date row for each month since the first create date until today for each issueid.

I have created a user function which will genereate a new table with all the necesarry new rows but right now it is only executed for the first row in the original table (issueid=225389)

Original tabel:

M-code:

User function m-code:

Result is fine but only for one issue id, I need the same for all the issue ids.

Then I am going to append the two tables.

I cannot figure out how to execute the user function for each row where issueid different from next issueid or GroupBy issueid.

Any help is appriciated.