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ERD and the Graph for billing many item in a bundle but once

Question asked by sstpierre on Jul 4, 2018


I'm stucked in my dev of an app where I try to build my ERD in the graph for a billing sys where a cust can

buy as many bundle he/she wants, but only once.


And same machinery should occur for the bundle: we could put as many "Cours" in it, but only once.

Choosing happens via Combo.


Maybe the hot weather here don't help me, but I'm sure the FMCommunity might help me out




here a graph of a split many to many relation

but how can I figure out the fact that the cust could only pick items only once.