Job needs to be triggered by a dataset which will be will be created by an another mainframe job (MAINT:N) running on the same lpar. However, the dataset is not cataloged in CA7 even after the dataset is created in the mainframe.
DSN panel shows the dataset as an external dataset. Does it mean that its expecting a U7SVC task .
What program is being used in job to create the dataset? The external requirement marking of the dataset does not mean it must be posted by U7SVC.
Try doing a LOAD of the job to CA7, if this dataset is used it will add it to CA7. Or you can manually add the dataset to CA7.