The following bug affects only the WINDEV ERP.
Open the project.
Search for IWR_tAccounting_TrialBalance
In the local UI_Refresh procedure of the above, make sure you have code that "stops" a user from entering dates that are in different fiscalYears and their fiscalYears are different from the current a360_nFiscalYear value.
Of course you can change the code in BP_tChartOfAccountsSum_Create and allow various other scenarios ..