>I am trying to revamp a database call in a VB.NET project, but now I keep getting a contraints error when I attempt to load the dataset. The dataset has 3 tables defined, but there is no relationship set up that I can see.
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>Where would I look in the ST dataset to see what contraints might be in place?

The easiest place to look IMO is in the XSD file. If there are no relationships then there are probably column or table constraints. They should be fairly easy to find.