Repeating a condition

Question: I assign X condition on some nodes and then assign Y condition on some nodes(include some nodes I select when assign X condition),then I write a calculate file,those nodes I select both when I assign X condition and Y condition only have Y condition value,but the X condition is lost.Could you tell me the reason?

Response: If you desire to apply a same condition (same name with different values) more of one times to a entity, this condition must be declared as CANREPEAT: yes in the *.cnd file.
If CANREPEAT: no (default), then the second same condition replaces the first:

Sample *.cnd:

CONDITION: Face-Load
CONDTYPE: over lines
CONDMESHTYPE: over face elements
CANREPEAT: yes
QUESTION: X_preassure
VALUE: 0
HELP: 2D case, X force for length unit
QUESTION: Y_preassure
VALUE: 0
HELP: 2D case, Y force for length unit
END CONDITION

Inside the bas file also exist a *CanRepeat keyword:
If command *CanRepeat is added after *nodes or *elems in *Set cond, one entity can be several times in the entities list of the loop. If command *NoCanRepeat is used, entities will be just once in the entities list.
By default, *CanRepeat is off except for the case of one condition that have the *CanRepeat flag already set.

Sample *.bas:

*Set Cond Face-Load *elems *canrepeat 
*# if canrepeat is missing, it is assumed by default  in this case, 
*# because Face-Load have CANREPEAT: yes 
*loop elems *OnlyInCond
Elem number=*elemsnum, Nodes of the loaded face= *globalnodes Px=*cond(X_preassure) Py=*cond(Y_preassure) 
*end elems