Validation also takes place when control flows from one procedure step to another passing data on a view. The dialog manager calls the screen manager verification services to perform this validation. This is true even if the procedure step being flowed to is execute first, in which no screen is displayed until the procedure step executes. If validation fails, then the screen manager reports the error to the dialog manager, which passes control to the screen to cause the target screen to be displayed. In this case, the screen is displayed first, even if the procedure step was marked as execute first, to allow the user to correct the erroneous data on the flow. In other words, if the flow verification fails, the target of the flow is treated as display first, regardless of how it is modeled. If the screen manager does not fail the validation, then the execute first/display first characteristic of the flow is executed as normal.
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