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On the main properties of the connector, select “Matrix Data” on the data structure type.
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For the Account dimension, select “Matrixed Text” as the Data Type so that the application knows that is one of the fields that needs to be matrixed.
- For each column that represents a different account, you will need to add an additional Account dimension reference as normal for a Matrix load.
Source: Office Hours 2020-10-22 Partner Enablement