p. 289 should be referring to the LRM special ability, not the IF special ability.
p. 289 should be errated with...
"Units and any Element with the indirect-fire ability may fire special munitions" IF special ability does not give any special munitions to fire. Replace indirect-fire ability with "LRM special ability".
"To create a weapon-delivered minefield with the Indirect Fire ability, the player simply nominates a target hex within range and makes an attack as if shooting directly at the hex; LRM and MML attacks include" BattleForce has no way to tell if its an MML attack, so this distinction should be struck. But also the "Indirect Fire ability" should be replaced with Artillery or LRM special ability. Then remove the "and MML"
"Indirect-fire minefields may also be set using indirect-fire rules. Regardless of the method used, this type of weapon-delivered minefield has a density equal to the IF rating of the Element setting the minefield." Change "IF rating" to "LRM long range damage value", leave the other indirect-fire references in this quote.