Can I Claim 100% ITC when GSTR1 not FILED by suppler

Dear Sourav, Thanks for the reply. 
I have edited my question, please check it and let me know if I can CLAIM Rs.7000 instead of just Rs.100, because the SUPPLIER is going to file GSTR1 by next month. 

To be on the safer side claim only 2000 in march and claim remaining 7000 in april

Yes you an claim GST credit upto 105%. In your case you will only be able to claim Rs. 100 in this case.

Further when the supplier will the GSTR 1 then the ITC will reflect in GSTR 2A of March 2021 but it will reflect in GSTR 2B in the month of filing i.e., GSTR 2B of April

It is better that you claim the entire input against this supplier in April after it reflects in GSTR 2B

Thanks a lot Altamush Zafar & Puja. I'll do as you say. Claim entire ITC of that invoice in the next quarter (Apr-Jun21)
I have another query..
as per TAX LIABILITY & ITC STATEMENT SUMMARY, I have not claimed ITC on many instances (months), the reason being these did not reflect in the respective month's GSTR2A, can I claim them NOW. 

Yes you can claim ITC provided you have the invoices and also make proper reconcilitations

Thanks for the prompt reply @ Atamush Zafar.
Yes I have all the INVOICES (soft copies). 
 

I am getting this message when I entered anything more that is available in GSTR2B for the quarter (Jan-Mar21).
"The information entered by you in cells highlighted in red is in variance with the auto-populated data in table 4A. The input tax credit has been auto-populated based on the GSTR-2B generated for you. Also, please note that any variance above 5% of the input tax credit is in contravention to Rule 36(4) of the CGST Rules, 2017. Kindly recheck and proceed."
Can I still CLAIM all the unclaimed ITCs as per ITC SUMMARY (2020-2021)

Yes, you can claim. I suggest all unclaimed ITC should be claimed in March, if you have sufficient explanation.

Ok. Thanks for the reply.