This warning appears if your default nominals for a branch have not yet been saved, usually due to a new branch being created. To resolve this, please follow the steps below to save the Default nominals:
From the DPS Home Screen select Tools.
Select Default Nominals.
Select the Branch which is quoted in the error message
A warning may appear stating 'The Default Nominals are not set up for this branch' If so click Yes.
If you wish for this branch to have matching nominals references to your other branches, click copy default nominals from other branch? and then select the branch you wish to copy them from.
If you wish for this branch to have differing nominal references to the other branches, click No, then manually add these.
Once complete, click Save.
Re-run your Year End, the error should not appear.