REST API Post rows to dependent table?

I discovered the error to be failure to close the previous response object. For your reference, documentation on setting up table relationships (as well as other properties) in datasets can be found at https://msdn.microsoft.com/en-us/library/mt742155.aspx.

Here is sample JSON for a dateset I used to test:

{

"name": "SampleData",

"tables": [

{

"name": "TABLE_A",

"columns": [

{ "name": "PRIMARY_KEY_A", "dataType": "string", "isHidden": "true" },

{ "name": "CUSTOMER_NAME", "dataType": "string" },

{ "name": "CUSTOMER_ID", "dataType": "Int64", "summarizeBy": "sum", "formatString": "#,##0;(#,##0)" },

{ "name": "SALES", "dataType": "Decimal", "summarizeBy": "sum", "formatString": "$#,##0;($#,##0)" }

]

},

{

"name": "TABLE_B",

"columns": [

{ "name": "FOREIGN_KEY_A", "dataType": "string", "isHidden": "true" },

{ "name": "CITY", "dataType": "string", "summarizeBy": "none" }

]

}

],

"relationships": [

{

"name": "TABLE_B_TABLE_A_REL",

"crossFilteringBehavior": "BothDirections",

"fromTable": "TABLE_B",

"fromColumn": "FOREIGN_KEY_A",

"toTable": "TABLE_A",

"toColumn": "PRIMARY_KEY_A"

}

]

}