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Why are the detail records not displaying in the master record form?
If you can no longer see detail records in a report that you've embedded on a master form, someone has changed the Filtering (matching criteria) for that report.
Check settings of the embedded report - particularly settings in the Filtering section. Reports you embed on a Master form should have no filtering criteria set. More details about adjusting embedded reports can be found here (specifically, see the FAQ at the bottom for more info).