Crystal Reports- use other records for condition? - database

Question

I am somewhat new to crystal reports and the syntax involved, and cannot seem to find the specifics by searching.
The problem is,
I need to check a condition of another record (linked as in image) for when Op No=10 in table Route, I must then check the Date Complete of this record in table WO Route Schedule for the same OP (see image for how they are linked) with a date input by user when the report is ran.
Table links
The jist is, im trying to show the font of a field in red when Date Complete>=FDate (user) (FOR OP 10), but since the actual list i am generating is of OPs that are not 10, I cannot seem to point crystal to look for when Op No=10, which is linked to the current OP by Route_ID and Work Order_ID! I have been trying many If statements, as well as using a case statement for when Op_No=10, but to no avail.
As a novice, I am not entirely sure of what other information is needed. Hopefully the images help explain my motive, but please ask for more info if you think this problem can be solved.
Regards
EDIT: More context if it helps (first comment)
Yeah it's hard to explain without overdoing the details, but each work order (WO) has around 100 operations (OPs). Now, crystal reports generates a list of OPs which are still active on the shop floor, but firstly it must check if a certain OP has been completed FOR THAT work order, which then produces a field with red font for when OP number 10 is completed. Now, if I was to simply put If {WO_Route_Schedule.Date_Complete}>={?FDate} , it would use the current OPs complete date, not OP No 10 for that Work order!

Answer 1

ok try below solution:
Place below condition in record selection formula .
{WO_Route_Schedule.Date_Complete}>={?FDate}
to find record selection formula go to File--> selectin formula ---> record
Place the op field OP No in detail section,
Now right click the op no field go to Format field ---> Tab Font ---> formula editor of color
write below condition there
if Op No=10
then crRed
else crBlack
Let me know how it goes