Fix import of AR/AP transaction batches.
(grafted from 8e01ccfd22c649e941d2ce0de5128e4a600c4622)

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extra : source : 8e01ccfd22c649e941d2ce0de5128e4a600c4622
Merge pull request #77 from ehuelsmann/1.4

Fix import of AR/AP transaction batches.