Add an instruction for each good receipt

Hello SAP gurus,

I'm looking to add some instructions during the good receipt for inventoried items (used in production). Currently, we are working with a "out-of-SAP" system and I would like to integrate these data's (with some others) into SAP.

The instructions that I need to appear is different for each articles (and sometime, I don't need to have one)

For Example :

Article A : Need to remove the second number of the lot (that have to be 0)
Article B : If customer 1, Control indicator on the pallet

Article C: Nothing special
Do you have a solution for me ? or some clue to reorient my investigations ?
Thanks in advance !