[SalesForce] Process Builder – Add Minutes,Hours to Event End Date

If you change the referenced field value and the schedule hasn’t been processed, Salesforce recalculates the schedule associated with that field. This includes removing the scheduled item if it no longer meets the requirements.

You can test this by triggering the flow and creating a scheduled action. Then find your scheduled action in the paused and waiting interviews section under Flows in Setup. Now, change your record that triggered the flow so it no longer meets the requirements. You should see the pending scheduled action removed.

Process Scheduled Actions Considerations

From docs:

If the process starts when a platform event message is received, associate the process with a platform event and an object, and specify matching conditions. Because every process acts on a Salesforce record, it requires a single record as a starting point. That way, the criteria and actions know where to start evaluating and executing.The process fails if it finds:

1) Multiple records that match the criteria.

2) No records that match the criteria.

This bit is bit funny from SF end, But you can bypass it, but providing a dummy record.

Create a dummy Object, with an external field `D_External__c'. Then create a single record of that dummy Object. And set Value of External Field as constant. eg 78234564654

Now add an extra field in your event My_External_Dummy_Field__C , and default its value as 78234564654 . The one you defined in the record you created.

This will make sure, each event fired will have My_External_Dummy_Field__C as 78234564654

In your Process Builder, Match your Dummy_Object's external field with My_External_Dummy_Field__C

As this matching condition will always match because of single record of dummy object and setting the default value of the platform event, your process builder will always run. And you can create do whatever you want.