Hello there 
Overview: I built multiple zapier automations and use sub-zaps to structure different parts of a big process better and pass information between the zaps.
Details: I only use the sends and starts of sub-zaps and don’t need to return any values to the inital zaps. So as I said: it’s just for a better structure within my process. Since it’s required to return values from a sub-zap to an initial zap and I don’t want to make use of this, I use the same text string for every successful run (“success”).
Error: The initial zap tells me “The app returned "Seen this checksum already"”. Makes sense since I always send the same value.
Question: Can I use sub-zaps without sending information back to the initial zap?
Alternative solution: is it enough to just send the current timestamp back so that the checksum varies for each run?
Thanks in advance and best regards
Philipp