RoSL was introduced to provide rebate of state taxes/levies where the state levies were becoming cost to the exporters. By providing rebate of state levies, the government has made sure that the export should not be burden with taxes and thus exporters may create competitive market outside, eventually for forex.
The erstwhile RoSL scheme was in operation till 06.03.2019 and has been replaced by the Rebate of State and Central Taxes and Levies (RoSCTL) scheme.
To my understanding claiming RoSL/RoSCTL and ITC (utilizing the same) will amount to double benefit. For instance, if your SGST is the part of the rebate for RoSL/RoSCTL and also you are utilising the ITC of SGST, then such situation will lead to double benefit. The scheme is for the situation in which embedded SGST are there which eventually becomes cost. The scheme is not for the taxes which you can take claim/rebate. Even the declaration for erstwhile RoSL bars from claiming double benefit.
"I declare that, I have not claimed or shall not claim credit/ rebate/ refund! reimbursement of these specific State Levies under any other mechanism and I am eligible for the rate and rebate claimed for. Further, declare that an Internal Complaints Committee (ICC), where applicable, in pursuance of the Sexual Harassment of Women at Workplace (Prevention, Prohibition and Re-dressal) Act, 2013 has been constituted."
In short, if it amounts to double benefit then you cannot take ITC SGST (utilise) and RoSL/RoSCTL both.
*the above comment is not well researched thus, you should seek professional legal opinion with more facts for the same*