This was already discussed.
http://psteamcommunity.yuanyoumao.com/workshop/filedetails/discussion/751991809/133259227515818642/

ConfigOverrideItemCraftingCosts=(ItemClassString="PrimalItemStructure_Personal_Grave_C",BaseCraftingResourceRequirements=((ResourceItemTypeString="PrimalItemResource_Stone_C",BaseResourceRequirement=10000.000000,bCraftingRequireExactResourceType=False)))

(For the grave cost 10.000 stone units)

Thank you, works like a charm. PrimalItemStructure_Personal_Grave_C is the right ICS to use.