Hi Pierre,
Your approach is correct, I don`t see other option as HCI cannot read from target tables.
Just group MD export together with import task into one process to ensure that second one is executed after download is completed.
I had a similar solution approach for KF load. I will share my scenario as you might find it useful.
I had to completely replace last 3 months (so wipe out everything before inserting), while INSERT_UPDATE for the remaining past horizon. I could not simply use the task with batch command REPLACE restricted to the last 3 months as this option replaces only the values for the combinations that overlap.
So I created a 3 step solution:
1) outbound data flows to download all values for the last 3 months
2) then i used the outbound file into an inbound data flow to write NULL for all combinations
3) run task in INSERT_UPDATE mode for the entire horizon
Regards
Alecsandra