This is just hardcode in another place. I need something to change easily in production systems, like stvarv.

For example I have BADI BADI_MMIM_CHECK_MATDOC_ITEM and can add custom logic in cloud app to block material mvt to specific storage location without reservation. I want to have parameter in tvarvc to change SL any time in prod system. As tvarvc table...

Hard code mean when for example you specified number of storage location in the code, instead if using tvarvc parameter.