Hard to tell WHY its not assigned if you don't tell us how it SHOULD be assigned? Did you write code to do so? Did you create a relation between your master and detail-block(which is the preferred way)?
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yes , of course , there is a master detail relation between the two blocks .
i think the problem is that the button's "Mouse Navigate" property is set to "no" , because i changed it , and it assigns the value now ,
but i have to make it "No" ,because the text-item beside it is required .
i found it ,
i can make the field required , and the mouse navigate = no , but
i should change the property of "validatioin unit" to "record" , not default which is item .
thanks a lot