From p 149 of the Alpha Strike Companion (under Formation Requirements): "If a formation type lists a requirement as a percentage, this refers to the ratio of units in the formation relative to its total. Because these rules apply equally to formations from 4-unit ’Mech lances to 10-unit Clan vehicle Stars, the number of units represented by this percentage value may need to be rounded up as necessary.
For example, the requirements for a Battle Lance indicate that 50 percent of the formation must be Size 3 or higher. In a four-’Mech Inner Sphere lance, that translates to 2 ’Mechs of Size 3 or higher (4 x 0.5 = 2). For its Clan equivalent—a Battle Star—this requirement increases to 3 ’Mechs (5 x 0.5 = 2.5, round up to 3)."
on p 150 (under Battle Lance), the following requirements are listed: "50 percent of the standard Battle Lance must be Size 3 or higher. If the Battle Lance is a vehicle formation, these Size 3+ units must also be pairs of the same vehicle model. At least three units in a Battle Lance must also be any combination of the Brawler, Sniper and/or Skirmisher unit roles."
If creating a Clan Battle Star, the requirement for size 3+ units is stated as a percentage, & therefore rounded up to 3 units.
But what about the requirement for "At least three units in a Battle Lance must also be any combination of the Brawler, Sniper and/or Skirmisher unit roles?
The rules state that "If a formation type lists a requirement as a percentage" it is adjusted to suit the formation size. As "at least three units" is not listed as a percentage, does this mean the requirement does not need to be adjusted? Or, based on a lance, should the requirement be converted to 75% of the units in a Battle Lance and converted to "at least four units" for a Battle Star?