Why is my BDC_CURSOR command not working to position the cursor?

Question

Why is my BDC_CURSOR command not working to position the cursor?  Here are the details regarding my issue.
I am writing a BDC to mass delete routing material assignments using transaction CA02.  I am OK to navigate through the initial screen to go to the Header screen and from here I am OK to navigate to the Material Assignments screen.  But once here, I cannot get the BDC_CURSOR command to take me into the list.  Here are the commands I am using.  Please let me know what I may try differently.
CA02 Material Assignment - Set position  <-- this resets list of materials to correct position
  PERFORM bdc_dynpro      USING 'SAPLCZDI'   '1010'.
  PERFORM bdc_field       USING 'BDC_CURSOR'  'RC27X-ENTRY_ACT'.
  PERFORM bdc_field       USING 'BDC_OKCODE'   '=ENT1'.
  PERFORM bdc_field       USING 'RC27X-ENTRY_ACT'  c_position.
CA02 Material Assignment - Delete
  PERFORM bdc_dynpro      USING 'SAPLCZDI'   '1010'.
  PERFORM bdc_field       USING 'BDC_CURSOR'  'MAPL-MATNR(01)'.    <-- this is not working to set the cursor into the list
  PERFORM bdc_field       USING 'BDC_OKCODE'  '=LOE'.             " trash can
  PERFORM bdc_field       USING 'RC27X-ENTRY_ACT'  c_position.
CA02 Material Assignment - Green Check OK
  PERFORM bdc_dynpro      USING 'SAPLCZDI'   '1010'.
  PERFORM bdc_field       USING 'BDC_CURSOR'  'RC27X-ENTRY_ACT'.
  PERFORM bdc_field       USING 'BDC_OKCODE'   '=BACK'.            " check mark
  PERFORM bdc_field       USING 'RC27X-ENTRY_ACT'  c_position.

Answer 1

Thank you for your reply.
I had used SM35 to record.  However, I was not aware of the "create program" feature.  I had commented out a section from my previous post which I have now added back (latest code below).  But it still did not resolve the issue.
When I execute with dismode = 'N', I get back error message "No batch input data for screen SAPLCZDI 1010".
When I execute with dismode = 'E' (only show dynpros when error), it stops at the material selection screen without placing my cursor in the list.  I can then MANUALLY click to set the cursor position in the list, MANUALLY click the trashcan, it then uses my BDC command to respond to the popup asking "Do you want to delete", still leaving me at the material selection screen.  I can then MANUALLY click the green check (or enter), then it continues with the BDC to go back to the previous screen, and saves.  But it still will not place my cursor in the material selection list (SAPLCZDI screen 1010).
Here is code used.  It is the second section of code labeled "CA02 Material Assignment - Delete" that is not working.
CA02 Material Assignment - Set position
this code functions to position the desired material to first in screen list
  PERFORM bdc_dynpro      USING 'SAPLCZDI' '1010'.
  PERFORM bdc_field       USING 'BDC_CURSOR'
                                'RC27X-ENTRY_ACT'.
  PERFORM bdc_field       USING 'BDC_OKCODE'
                                '=ENT1'.
  PERFORM bdc_field       USING 'RC27X-ENTRY_ACT'
                                 c_position.
CA02 Material Assignment - Delete
  PERFORM bdc_dynpro      USING 'SAPLCZDI' '1010'.
  PERFORM bdc_field       USING 'BDC_CURSOR' 
                                'MAPL-MATNR(01)'.
  PERFORM bdc_field       USING 'BDC_OKCODE'
                                '=LOE'.             " trash can
  PERFORM bdc_field       USING 'RC27X-ENTRY_ACT'
                                 c_position.
Acknowledge Pop-Up Screen
  PERFORM bdc_dynpro      USING 'SAPLSPO1' '0100'.
  PERFORM bdc_field       USING 'BDC_OKCODE'
                                '=YES'.
CA02 Material Assignment - Green Check OK
  PERFORM bdc_dynpro      USING 'SAPLCZDI' '1010'.
  PERFORM bdc_field       USING 'BDC_CURSOR'
                                'RC27X-ENTRY_ACT'.
  PERFORM bdc_field       USING 'BDC_OKCODE'
                                '=BACK'.            " check mark
  PERFORM bdc_field       USING 'RC27X-ENTRY_ACT'
                                 c_position.