I m using PWA, MS Project 2016, version 1803 Sai If you follow the steps: Set Task Fixed Units 1 day duration, no resources assigned. Then Advance tab set to fixed duration Detail View: Assign resources A 3h. and B 5h. Ok. Task maintain 1 day duration Now change duration to 5 days, warning: reduce work (check) and all resources were distributed: A 0,6h and B 1h.
Have another solution: File options set: Fixed Work Add resources: A Max units 0,37 (3/8) and B Max units 0,63 (5/8) Set task 1 day duration and assign resources A and B Change duration to 5 days, warning check reduce work… All resources were distributed