How to use conditional basis entity data in write to multiple data store entity

If you don't have anything to write for a particular Entity entry, you will need to set that list item to EMPTY SET ( {} ), because NULL() actually carries a value and will cause the node to error.

This makes some assumptions into the validity of your null checks.  The second null check (for pv!dependencies) seemed backwards so I switched to the opposite rule (since you wouldn't be writing pv!dependencies if it's actually empty).

{
  if(
    a!isNotNullOrEmpty(pv!dependencies),
    {},  /* null, */
    a!entityData(
      entity: cons!DSE_COMMUNITIES,
      data: pv!communityAllocation
    )
  ),
  if(
    a!isNullOrEmpty(pv!dependencies),  /* note, switching the null check rule used here */
    {},    /* null, */
    a!entityData(
      entity: cons!DSE_DEPENDENCIES,
      data: pv!dependencies
    )
  )
}

Thanks for reply.

By putting empty set with your code, it still gives same error as above..

Thanks for reply.

By putting empty set with your code, it still gives same error as above..

Care to show the values of the PVs?

You would need to ensure there's actually a value in pv!communityAllocation, since neither your original code (nor neither my revised code above) actually checks that.  Without a bit more detail provided (like the values of the PVs in your errored process instance, as already requested), we're kinda guessing in the dark here.