Thanks for reaching out. The ‘Basic Count’ application requires that the journal batch be posted in Business Central, posting is not supported from the handhelds.
Our Advanced Inventory Count add-on (the ‘Count’ application on the handhelds) does allow posting directly from the handhelds, though the recommended approach is to review the count data in Business Central prior to posting.
We do intend to include an ad-hoc item adjustment application in a future product release. There is no firm ETA on when that will be at this time though.