I just started using SAS EM. And I imported an excel file with three variables into SAS EM: Customerid, Item and Sequence. Sequence stands for the sequence of transaction in this person's shopping history).
I linked the file import node with association node. However after I ran the association node, it kept throwing out error messages like this: "Must have at least 1 transaction data set(s)". It's the same error message with market basket analysis node. Any suggestions?

when you define the data source define the role of the dataset as "transaction". this will be on Data Source Attributes page of "Data Source Wizard"