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please help

 
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I am trying to learn to use websphere. I have encounter a strange problem don't know how to solve. I created a CMP entity bean, then I created its mapping to Cloudscape(V51_1). Then I modified some fields in the entity bean. To remap the new bean, I deleted the old datasource(V51_1). Then I remap the new entity bean to another Cloudscape. The system gave me (V51_2). Now there is the error when I am trying to validate the bean. The error message says I have a broken mapping to V51_1. But I already deleted that datasource, why is this happening? How can really delete the original mapping? Thanks.
 
Yuan Ye
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I figure it out. I also need to delete the entry of "backends" -> "V51_1" in the data prespective to avoid the validation error.
 
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