dealing problem with microflow i guess

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hey !! i am totally new to the mendix  i am developing a app that manages the books in the college library here i created a entity named student,book,book_order now when ever a new order is made i need to decrease the quantity of the specific book how can i do this i am totally clueless right here !!    Any sort of help is highly welcomed!! thankyou!    
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Hello Sandesh,

Whenever you are creating an order, decrease the book quantity using change object in the microflow/nanoflow. It will work for you.

Hope my answer helps. Reach me out for any queries.

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Change microflow parameter to book not book_order

Don’t create new book use the microflow parameter and change object

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No change the object to book, not the name

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so in the microflow i should first store the data of order and then use the change object ?? am i doing it right??

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how do i change?? is is like this?? but 

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this is ok 

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i think i’ve understood now 

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but it’s not actually decreasing the quantity

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why is this error popping?? i think i am near to the solutoin 

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