unit to be inspected and serial number

HI EXPERT:

I'm working on QM  result record using bapi:BAPI_INSPOPER_RECORDRESULTS (SINGLE_RESULTS).

we write serial number to field EXT_NO.then commit it success. After that we make UD for inspection lot.

My problem is I found no record of serial number in this inspection lot. ,and ,no record in table SER04 and OBJK

When we use TCODE :qe11 to record result .The serial number will be update to table ser04.

My data:

material plt data 2 view:

                                 serial number profile(QMSL AND MMSL)

Quality view:

                                  Serial Number Management Possible=X

Inspection plan:

                       External Numbering of Units to be Inspected=3

I guess someting wrong with Bapi ,hope someone know it.

thanks

Tony