Hello @pavon,

Please see the attachment and I submit to believe - you may be missing some crucial concepts.

Have you seen this? The following are examples of query and invoke as documented by Tong Li in the github.

minifab invoke -p '"query","a"'

minifab invoke -p '"invoke","a","b","24"'

Please review the Read The Doc on Hyperledger Fabric and also Minifab documentation.
Both the resources feature a tremendous documentation. I think this is what you need to pay attention to.

Hope the attachment helps. Best of luck.