I was trying to update valid from date in PLPO table ( SE11 and then by debugging the selected entry). I am able to change date however system do not accept control key PM01 while saving. I am getting msg Entry PM01 does not exist in T430 (check entry) . If I drop down to select control key I am getting PM01 control key in drop down menu. I tried to select deferent control key however I am getting same error (Entry XXXX does not exist in T430).
I was able to update valid from date in PLKO table without any error. I tryed by SE16N , &sap_edit. I am getting same error.
Please throw some light to resolve this problem. screen shot attached.