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I'm trying to write to multiple outputs. In total, there will be 13 output files with 3 tabs each and 1 output file with 42 tabs. I've tried putting Block Until Dones in basically every possible position within the flow but that doesn't seem to solve it. Does anyone have any tips on how to write to this many output files without getting the "Unable to open file for write" error?
However, if you're keen to stick with your original flow, I think the issue is just the placement of your Block Until Done tools. You're currently staggering the final step (i.e. the 1 and 2 in A/B). However, you need Block Until Done tools a step before in order to ensure that Alteryx doesn't run A + B parallel, which will cause issues as B is currently trying to write to a file already being written to by A: