You are displaying values using App P&L - Actuals. You find Balance Sheet accounts are also shown in this report.
SAP S/4HANA Cloud
Reproducing the Issue
Display values using App P&L - Actuals.
A couple of similar reports like Cost Center - Actuals, Profit Centers - Actuals, Market Segments - Actuals, Projects - Actuals etc. are the same like App P&L - Actuals, where the Balance Sheet accounts are possible to be shown.
They are pretty similar and often use the same account hierarchies. The purpose for this design is to keep the symmetry across all these report so that one can use the same master data and same hierarchy.
Therefore we do not exclude in the App P&L - Actuals for the Balance Sheet accounts.
Whether an account is shown in P&L - Actuals is determined by the account hierarchy(Financial Statement Version) you used.
You can define and use the Financial Statement Version which only contain P&L accounts.
You can also save the filter as the default filter for the Apps to just include P&L accounts. So the filter will be applied whenever you start the App.
To create or change financial statement versions you can use App Manage Financial Statement Versions.
FSV, Manage Financial Statement Versions, P&L, BS, Balance Sheet, exclude, include. , KBA , CO-FIO-OM-IS , Reporting , Problem