What is the cause for the error in the union activity?

A business practitioner is creating three different activities:

1) Targeting a recipient with a specific email domain

2) Targeting recipients that are over 30 years old

3) Targeting deliveries with a delivery status equal to failed

The business practitioner attempts to combine the three results using the "Union" activity, and they receive the following error: "The document types of inbound events are incompatible (step ‘Union’). Unable to perform the operation."

What is the cause for the error in the union activity?
A . Three different activities have a different number of rows and therefore cannot be combined together
B. Different types of the inbound transitions; email domain and delivery status are strings and age is a numerical value
C. The business practitioner forgot to configure the primary Union set of data in the activity
D. Inbound transitions containing populations with heterogeneous targeting dimensions

View Answer

Answer: D

Explanation:

The error in the Union activity is caused by D. Inbound transitions containing populations with heterogeneous targeting dimensions1.

The Union activity is used to combine two or more populations. The inbound transitions must contain populations with the same targeting dimensions. In this case, the three different activities have different targeting dimensions, which are email domain, age, and delivery status. Therefore, the Union activity cannot combine the three results together2.

https://experienceleague.adobe.com/docs/campaign-classic/using/automating-with-workflows/targeting-activities/union.html?lang=en