The element <reqCondDm> contains the required action/condition when satisfied by completing a procedure that is described in a separate data module.The element <reqCondDm> is used to describe the required action/condition and the element <dmRef> to contain the reference to the data module that contains the procedure to fulfill the condition.The required action/condition must be equivalent to the full procedure in the referenced data module.The text of a required action must be written as a statement that can be carried out, by a trained mechanic, with support of the referenced data module if needed. For example, write "Make the engine safe for maintenance".The text of a required condition must be written as a statement that can be evaluated true or false with support of the referenced data module if needed. For example, write "The engine is safe for maintenance".