tow subreports in my mianreports,why the second's data can't show?

[vvkl]

In main report,I'll show a table named "Engine".
Table "Service" and "Sparepart" are relationed by "EngineID" on table
"Engine".
I drag two sub reports in main report to show "Service" and "Sparepart",but
"Sparepart" doesn't show.

I expect effect is that :
Fisrt, an Engine's record, then all of "Service" record which relationed
with the "Engine", then all of "Sparepart" record ...continued displaying

Thank you!
(I'm a chinese student ,If my question have syntax error,please excuse me!)

 

[Marshall Barton]

In main report,I'll show a table named "Engine".
Table "Service" and "Sparepart" are relationed by "EngineID" on table
"Engine".
I drag two sub reports in main report to show "Service" and "Sparepart",but
"Sparepart" doesn't show.

I expect effect is that :
Fisrt, an Engine's record, then all of "Service" record which relationed
with the "Engine", then all of "Sparepart" record ...continued displaying

Thank you!
(I'm a chinese student ,If my question have syntax error,please excuse me!)

Check the subreport controls (on the main report) and make
sure that the Link Master Fields properties are set to the
EnginID field and the Link Child Fields properties are set
to the related field in the subform's record source table.

 

[vvkl]

Thank you for help