Currency ID blank during e-connect Integration

During an e-connect integration, we might come across a situation where the currency ID remains blank in the transaction entry despite having a functional currency set up correctly. The issue can be resolved by making sure there is a checkbook ID in the company that has a currency ID associated to it or an item associated to a currency ID.

Another place to check is to ensure that the functional currency Index value in company database (MC40000) matches the currency index value in Dynamics Database (MC40200).
Source: Dynamics GP Forum Help Thread

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Currency ID blank during e-connect Integration