Data entry failed- ledger or item does not exist error.
If you facing this type of error while creating any order from mobile application.
Step 1: Alter that particular ledger or item in tally and check in the name is there any extra space at the end of the ledger or item name. If yes then remove that extra space and save it.
As you can see in above image there is a space between the cursor and item name. So you have to remove that extra space and have to save stock item.
Step 2: After doing changes in your item or ledger name order entry will work fine and your entry will be successfully synced with tally.