apply fixed value overhead at each material level - Overhead costs

Hi,

we usage modular costing successful our system. the costs are summarized astatine BOM and gets updated successful the MM record. its a yearly process. we person to adhd a overhead costs (Tariff costs) to the MM grounds astatine the worldly level. we recognize the modular functionality is to use a percent of the material  costs arsenic overhead successful the modular outgo estimate.

Our request is adhd a outgo for each material, Material A whitethorn person 5 USD to beryllium added to worldly costs, Material B - 3 USD to beryllium added to worldly costs and truthful on. 

is determination a mode to bash this successful SAP to adhd the costs astatine worldly level and marque the strategy to cipher it ? Phantom worldly is not allowed.  Please advise. 

the different enactment we thought is to usage MR21 tcode to update the terms by calculating successful an excel sheet. we privation to usage it lone if thing works.