Instructions and information to assist you in completing this form. Download a PDF copy of the regulation below.The CASL Form is used to validate authorized signatories to protect vendors and the Commonwealth from fraud. You must submit IRS form W-8BEN with your withdrawal request. Download and print form. The Interdepartmental Service Agreement (ISA) is the contract that documents the business agreement (joint venture) between two Commonwealth departments. In cases of withdrawal, nominations to fill vacancies shall be filed with the state secretary within seventy-two week day hours succeeding five o'clock. Complete the following information for each person to whom the registrant has assigned any advisory contract to provide municipal advisor-related services. A motion to withdraw is a document an attorney files with the court when that attorney no longer wishes to represent his client. Contract opportunities on SAM.