Saving assembly(wf4)

Dear friends,
Please find my problem below;
Lets say that I have a main folder named A and sub folders named b,c,d.
When I set working directory as b and create an assembly with parts from b,c,d
and save the assembly close the it and open it result is "can not create assembly".Alo if I choose the working directory and create assembly with parts using b,c,d the result is same.
Please help me.
Best regards.

it is all true, sadly Pro/E by default opens/search all files in working directory.

But, luckly to you there are at least two way out:

1) buy some PDM software to handle your data ))))

2) create search.pro text file with appropriate path to all your models, then indicate this file in appropriate Tools>Options setting