Budget check in ECS

Hi all,

SRM 5.0 Sp17 ECS

We are having lot os issues during budget check in SC and PO.is it possible to deactivate the std budget check and implement custom logic to check the budget correctly in R/3 abckend system from SRM??If so,how???I know the BADI to deactivatethe budget check in SRM but how where do I put my custom logic to do the budget check??

Thanks.