Thanks Berserker, writing SN:W vars at OnTransferHero seems to be valid.
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I want to share a finding about w51 - w100.
Accoridng to ERM help, values of w51 - w100 are stored for all the time until ERA is closed. However, this is proved to be wrong according to my tests. Some of these w-vars got changed unexpectedly.
You would like to:
1. End turn to write the w vars for Christian, start a new scenario and see if you got the same results.
2. Restart the scenario after ending turn, check the reuslts.
Conclusion (more tests required): w51, w54 - w60, w79, w81 - w100 seem to good. They are the only variables that don't get reset until ERA is closed.
Other w vars should be avoided if you are in need of the w-var carryover feature.