Date fields missing when mapping a infoobject with time dependent attribute
I'm in BI 2004's (7.0) trying to build a transformation. In fact, it's a modification in standar transformation to load 0CCA_O09 DSO from R/3. I added 0PROFIT_CTR infoobject to that DSO, and i want to read master data from 0COSTCENTER to fill profit center in DSO. That attribute is time dependent, so i have to push on the "clock button" to select the date to read master data. Three options are aviable, and i need to select BUDAT as date field. So i select third option "start" and push matchcode to select BUDAT. Well, what a surprise when NO date field appears, i get message "No values found".
Before that, i added BUDAT as source fields of rule, and mapped it with 0DATEFROM in infoobject assignment. I don't undestand anything at all...
I think i'm doing well, but i have not found any OSS note about that.
I pray for help, it's driving me crazy. If i don't get it, i will leave SAP world and i'll exiliate myself in a far mountain like an hermit.
Thanks in advance.