Unbilled Revenue in GST

Anil kumar (job) (33 Points)

09 April 2019  
we have provided some services in March 19, for which neither invoice has been issued nor any amount has been received from recipient of services.
so, we have shown the same as unbilled revenue in 31.03.2019 in books.

please advice how to show the GST applicable on it in books as on 31.03.2019.
and whether we have to deposit Gst over it on the basis of unbilled rev. or at the time of raising invoice.