When all entries are made and all proposal pages have been successfully committed to memory, have XRPS go through all observations again to perform a few basic checks by hitting the ``Check Proposal'' button.
If all entries are formally correct and no compulsory entries are missing, XRPS will report an ``OK'' status for each observation individually. An example is displayed in Fig. 17. In this example the user is warned that OM is not used during the entire observation.
In case of formal errors or omission of mandatory information, XRPS will return error messages and ask the user to update the appropriate entries. This procedure must be repeated by using the navigation tool in the left-hand frame to go back to the pages and apply the necessary changes until the proposal passes the checks.