子报表参数未显示为用于在Crystal Reports 2008中链接的可选参数

Question

I have a crystal report designed in vs 2008 crystal reports. There is the main report and 3 sub reports. Each of these sub reports and the main one have information generated by a report number the fields are not named the same but in two of the three sub reports i have been able to link the parameter to the main report parameter that i am passing in the code behind. However when I go to link the third subreport the parameter used is not showing up in the dropdown used to select the parameter to link. Anyone have any ideas why this might be happening.

I have a horrible tendency to speak in shorthand so if you need more info let me know and I will do my best to answer. Thank you for your help.

Answer 1

Ensure that the fields that you intend to link are the same data type.

Incidentally, this is how Crystal Reports 'supports' heterogeneous joins. You can link a string to a numeric value, as long as you convert one of the fields to match the data type of the other (via a formula field).

I've also gotten around the heterogeneous-join issue by converting one of the fields using a SQL-expression field. Then you perform the 'linking' in the record-selection formula.