How to update a field of BO using association or From Another BO

Hello Experts,

I have 2 Bussiness Objects and I need to update the field which is declared in 1st BO, I have written some logic in 2nd BO, when ever i get result from that logic,I need to update the field of the first Bussiness Object based on that result , Please help me to resolve in this .

Thanks and Regards

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Ravikumar H.R