Refund in Deemed Export in case supplied to EOU

A user is encountering a GST portal error when trying to file a deemed export refund application for October-December 2019. The system requires previous period refund applications to be filed first, even if they are nil returns. This is to prevent the repeated use of accumulated Input Tax Credit (ITC). The advice given is to file nil refund applications for all preceding periods before attempting the current one, although the user is facing issues with specific months not appearing in the dropdown for nil returns.