Simply, the accounts you set up in hte GL table in RMS which generates the posting must be in balance. Every install is different, so my gl table would likely be different from yours as the nature of hte transactions would be.
The simplest way from me to learn in the process was post all the other accounts i was not sure of to suspense to get it to balance. Then i worked through the postings to proper accounts.
If you are not using the direct interface to QB i suggest you use it rather than the export/import.