Inserting two enties in a transaction & getting 'Cannot operate on different entity groups in a transaction' Error?

I've fixed this problem but it the solution is unrelated to the setup mentioned above. As I had previously stated, my actual class contains some validation code within the InsertData method. Portions of the Validation logic were taking place in the txn() method.

I assumed that this wouldn't be a problem because all my validation does is check to be sure that there are text values within certain parameters and that one specific parameter is of a certain length.

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