Your data source doesn't support what you are trying to do - you have a repeating table, bound to InfoPathTest, inside a repeating section, bound to InfoPathTest. The only way you could do this would be if in your data source you had a repeating group nested inside another repeating group. If you are trying to use data from multiple data sources - like, you have a repeating group in your main data source, and are trying to put a repeating table from a secondary data source inside a control bound to that main data source repeating group, you would run into the same issue.
You can, in your main data source, nest repeating groups like this - but if you want to populate them with data from secondary data sources (guessing here that may be what you want to do) you'll have to write code or use qRules to accomplish it.
Sorry I don't have any happier news for your Friday!