Thank you JR for your reply. Not sure you fully understood my question, excuse me if not clear.
I know purchases are not required to enter, but any unit that wants to be setup on map at start of a next CG Day, must have entered that previous day, and been on-board when that previous CG day ended.
When both sides choose an idle chit, the purchases on the idle day (both sides) become retained. Unlike Red Barricades, these retained units are not available for on map setup, but have to enter the board to be in play. CG9 Retained RG rule explains a retained RG (whole or part) not entering-play/used during a CG scenario, is still available for the next CG scenario. I understand it is available, but cannot locate in rules that one can assume that they can be setup on-map at beginning of the next CG scenario.
per CG8 current day purchases and retained units must enter on/after turn 1 along with following day's current new purchases.
My current Hatten opponent feels he can do on map setup of previous day retained units, I just do not see that stated in rules.