can not call DataSource function during an action

During an action if we want call another action in turn, we can use xxActions.yy.defer()
But if During an action I want to call DataSource function, it will give error "cannot dispatch during an action"

How can I call DataSource function during an action?

The context is
I have a submit button, it should submit data by calling DataSource function, but before submit I wanna validate the data. so when click button, I send an action set the submitted flag and validate all data, if no error, I will call api to submit the data, if has error, won't call submit.

But I got error, Dispatch.dispatch(...): Cannot dispatch in the middle of a dispatch.