1 - For Payroll related enquiries, it is always preferable to mention for what Country since many things in Payroll are Country Specific. Also, posting it in the Payroll Forum
or one of the Country Specific sub-forums can sometimes be helpful.
2 - What is JV? Because you seem to imply that a G/L Account # does not exist for WTs /3G0 and /3G3, is it possible that you recently upgraded your system? Note that the description (and use) of these Technical WTs could be different from one Country to an other.