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Cannot save Links in Database Export

I am using Crystal Reports 2013.  I just add a an additional table in my report and I tried to establish a link to the new table.  I saved it but everytime the link I saved has disappeared.  My question is :

1.  Can I only establish link using primary key or secondary key in the link?

2. If I tried to establish link between 2 tables but the field is not part of the key, is there any way I can establish the link?

3. When I saved my link.  Crystal Reports never given me any error.  So I though the link I established is ok.  But it disappeared everytime I check back.  If I can not establish link without using key, then Crystal Reports should have error message appears and warn me.

Any idea of how to fix this problem?

Former Member
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