After transferring the product list and performing End of day on the POS terminal, when trying to POST on the POS administrator computer we get the following error:

I cant seem to figure out what this "unprocessed transaction" is? We have done end of day successfully and transferred the product list, so I'm not sure what is wrong.
When we then try and post it works but un-ticks the transfer customer balances option.
The reckon user manual does not provide an answer.
Please, help!
Thanks!
Kylie.