URGENT:Problem in a mapping with 8 tables in JOIN and using the DEDUP op.

I have an urgent problem with a mapping: I must load data from 8 source tables (joined togheter) in a target table.
Some data from 1 of the 8 tables have to be deduplicated, so I created a sort of staging table where I inserted the "cleaned" data, I mean, the deduplicated ones.
I made it to make all the process faster.
Then, I joined the 8 tabled, writing the join conditions in the operator properties, and connected the outputs into the fields of the target table.
But..it does not work because this kind of mapping create a cartesian product.
Then, I tried again with another mapping builted up in this way: after the joiner operator, I used the Match-Merge Operator and I load all data into a staging table exactly alike the target one, except for the PK (because it is a sequence). Then, I load the data from this staging table into the target one, and, of course, I connect to the target table also the sequence (the primary key). The first loading works fine (and load all the data as I expected).
For the next loadings,I scheduled a pre-mapping process that truncate the staging table and re-load the new data.
But..it does not work. I mean, It doesn't update the data previously loaded (or inser the new ones), but only insert the data, not considering the PK.
So, my questions are as follow:
1) Why loading the data directly from the joiner operator into the fact table doesn't work? Why does it generate a cartesian product??
2) The "escamotage" to use the Match-Merge operator is correct? I have to admit that I didn't understand very well the behaviour of this operator...
3) And, most of all, HOW CAN I LOAD MY DATA? I cannot find a way out....

First of all, thanks for the answer!
Yes, I inserted the proper join condition and in fact I saw that when WB generates the script it considers my join but, instead of using the fields in a single select statement, it builts up many sub-selects. Furthermore, it seems as it doesn't evaluate properly the fields coming from the source tables where I inserted the deduplicated data...I mean, the problems seems not to be the join condition, but the data not correctly deduplicated..

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URGENT:Problem in a mapping with 8 tables in JOIN and using the DEDUP op.

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