Input tax visible in 2A not 2B

Hello,

If I have eligible input tax for April month visible in GSTR2A under B2B invoices and not in 2B.

Also, I realized under 2A that the supplier has filed his April months GSTR1 on 12 May. 

Is it because supplier has filed GSTR1 on 12th April or is it something else? Can I claim input tax for invoices visible in 2A but not 2b?

Thank you in advance