Hi @ifelix! In this case there is no dependent relationship between customer and refnbr, so this type of parameter is not going to work.

What you would need to do is make a custom table which could have this relationship already defined, then you could use it in the report parameter.

you could look at Report Parameter dependent on another Parameter/Filter Customer Parameter to Parent Account • Acumatica Report Designer • Acumatica User Group Forums (augforums.com)

it seems there is the ability to filter “certain” parameters by other parameters already selected but it depends on the tables available. check royce’s reply