Fix net_amount duplication in balance sheet report

[danieltaft]

…by including source_relation in cross join.

Now the net_amount shouldn't duplicate when mutliple xero sources are used.

Pull Request
Are you a current Fivetran customer?

Daniel Taft, founder
dashlytix

What change(s) does this PR introduce?
Bug fix

Did you update the CHANGELOG?

• Yes

Does this PR introduce a breaking change?

• Yes (please provide breaking change details below.)
• No (please provide an explanation as to how the change is non-breaking below.)

Did you update the dbt_project.yml files with the version upgrade (please leverage standard semantic versioning)? (In both your main project and integration_tests)

• Yes

Is this PR in response to a previously created Bug or Feature Request

• Yes, Issue/Feature [https://github.com/[Bug] Balance Sheet duplicating totals when multiple companies are consolidated #29]
• No

How did you test the PR changes?

• CircleCi
• Local (please provide additional testing details below)

I re-ran the balance sheet report with these changes on a dbt project with multiple companies and the package compiles and now the net amount variable is no longer duplicating.

Select which warehouse(s) were used to test the PR

• BigQuery
• Redshift
• Snowflake
• Postgres
• Databricks
• Other (provide details below)

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