Sorry for the misunderstanding. In Engine terms Reinforcements are units and Replacements are chits of F2 ledger. My bad.
NUM cavalry use NUM Replacements but NUM infantry use AFR (African) Replacements. AFR Replacement is not allowed for Marius Faction.
This will be discussed between team members. If everybody agrees, it will be fix in next patch.
Thank you for reporting
Marco, perché vai così forte in salita?» «Per abbreviare la mia agonia.