RM07MMBL change the document data and posting data

     When we upload the initial stock for MM,we want give a certain date for document and posting .But ,for LSMW with program RM07MMBL and object 0110, SAP will take the current data as the posting and document data.How can we change it?
     In fact  ,object 0110 offered this 2 fields in object overview of LSMW :







But we can't find it in step 5 (Maintain Field Mapping and Conversion Rules) . Is it possible?

 Sure,click on the menu extra-->Layout in step 5(Or Ctrl +F7)


Tick check box "Technical fields",

 


now you can see this fields,just assign your source field to them ,then,everything is working .