problem master-detail TIBDataset

hi!

IBDatasetMaster = one records
IBDatasetDetail   =  two records

the two CachedUpdates True.

parameter name for the detail ibdataset is  identical to the column name of
the key field in the master ibdataset.

problem:

before apply updates and after save (IBDatasetMaster.Post) the
IBDatasetDetail is empty.

sorry for my english

many thanks
Andr