If a service in some period can start only on for example Saturday you need to do the following:

  1. Enter a new price list
  2. There is 1 price list row predefined.
  3. Locate the Net line of that price list row and the period where this shall be defined.
  4. Roll over + button of the cell to get additional options tool tip.
  5. Find Allowed starting days field in that tool tip and uncheck all days except Saturday.
  6. Locate the Selling line of that price list row and the period where this shall be defined
  7. Roll over + icon of the cell to get additional options tool tip.
  8. Find Allowed starting days field in that tool tip and uncheck all days except Saturday.
  9. Enter net prices and margins to get selling prices.
  10. Click OK to save changes.