Matchcode Field

Hi,

I need to créate a custom matchcode field in a selection screen of a Z program. The values of the matchcode are not referred to a value range of a table. Instead, the values for the matchcode will depend on the own values for each material. I mean, imagine that we have a material with two BoM alternatives an another material with three BoM alternatives. When I select the matchcode for the first material the matchcode will show 1 and 2, and when I select the matchcode for the second one will show 1,2 and 3.

¿How can i do it?

Thanks a lot.

Regards.