Hello,
The configuration you have indicate that the vendor cannot edit the price while he create a product ; but once the product is validate, he can edit them.
The ACL "product / add" is when you create a new product and "product / edit" is when you edit an existing (and approved) product.
Goal of that distinction is for the product approval and product creation ; you might want to give more access during the product creation than after its approval.
The current ACL on prices do not have the "logic" on "add" or "remove" ; it would require the addition of new ACL(s) and right now I don't know which would be the best "names" (to not generate issues during updates).
Afterwards, with the major release coming ; it might be the best moment to add such kind of ACL...
It needs some thinking (and use cases).
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.