Properties on individual signals from a net

Hello,

I tried the next example and i don't know exactcly what is it wrong; I start from a schematic view;

- I create a net with the label: net<0:2>; this way the net contains 3 signals: net<0>, net<1>, net<2>;

- I select the net and I run, one after other, next commands:

myNet = css()->net    ;;get the net object
sig0 = car(myNet->signals)    ;;get the signal0 object

sig1 = cadr(myNet->signals)    ;;get the signal1 object
sig0->name     ;;only to be sure; it returns: "net<0>"
sig1->name      ;;only to be sure; it returns: "net<1>"
dbCreateProp(sig0 "myProp" "string" "magic")     ;;I create on the object sig0 the string property named "myProp" with the value "magic"
dbGetPropByName(sig0 "myProp")->value     ;;only to be sure; it returns: "magic"
dbGetPropByName(sig1 "myProp")->value      ;;only to be sure that the property is put only to one signal; it returns: nil , which is ok;

Now it comes the tricky part: In schematic window, i press: check and save; I recive the message: "Schematic check completed with no errors." and now I run the last command of sig0, to check if the property on my signal sig0 [sig0->name == "net<0>"] is still there:

dbGetPropByName(sig0 "myProp")->value    ;;I recive nil 

 Why did the property disappeared ?
How can I put a property only on a signal from a net without losing it after check and save?

Thank you,
Best regards,
Adi.

later edit:

one more thing: If there is any netl with the label name net<0> in the cell view, it is treated like the firs signal of the net<0:3> bus and in this case the property acts normally (remaining after the check and save).My problem is whan I have in my cell view only the bus.