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En un FAQ sobre IBX encuentro lo siguiente:
Pregunta:
When using Cached Updates with a Master/Detail relation, details disappear when I post. What gives?
Respuesta:
This behavior is up at the TDataset level. When you go into Edit mode (or when you ApplyUpdates) the DataLink is passed a message that the cursor has been repositioned. This message will cause detail queries to close and re-open on the "new" position. The only way to stop this is to break the DataLink. Set the detail's DataSource to nil before applying the master's update.
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