Multiple relationships in data model

[#1]

Hello QV developers,

can anybody please give me any advice, how to deal with multiple links between tables?

I think, there are two options. First is use aliases and create for each ID new unique column, but I think there will be problem with loops anyway. Second option is create link tables.

What is the right or best solution?

My data model is here (also in attachment):

Thank you for any help!

Best reagrds

Mirek