gst return json file generation error

dear sir.....

I m filling gstr1 for July 17 but I got error of invoice number
for example my bill number is 1/17-18 and second bill is 2A/17-18 both are taxable invoice value in this case second number bill is not accept in GST when I generate json file so, pl. help me why not accept the bill?
we are in logistics industries therefore we have to make two bills for one job one is taxable invoice second is receipted charges invoice i.e. invoice number is 1/1-18 and 1A/17-18 and sometime we have to make both bill in one then bill number is 2A/17-18 only.