Issue in Composition to Regular conversion

Ninad Taralekar (83 Points)

18 March 2019  
I got new client who not filed a single return since registration. He is service provider( Architect). But old consultant who applied for registration , selected composition wrongly.
I withdraw from composition by filing CMP-04 but effective date is allowing only upto 01.04.18. Now portal not allowing to go back to regular scheme for F.Y.17-18. Client issued invoices in 17-18 & charged GST 18%. Please provide expert advice. Thanx in advance.