Error on Download check

[viralkansodiya]

Error occurs when clicking the "Download Checks" button.

[viralkansodiya]

@agritheory during the testing found some error please look at this issue

[agritheory]

@viralkansodiya That's a custom field that seems to have leaked from another application. We want to use the posting date, since Expense Claim doesn't have a due date

[viralkansodiya]

fixed This issue in PR #209

[agritheory]

@viralkansodiya Let's close this once #209 is merged