title: Make a hotspot cell F4-enabled while insert. Possible?
body: <p>My requirement is as follows:</p>
  
  <p>I show records in an alv grid (CL_GUI_ALV_GRID), where the user can add new ones.</p>
  
  <ul>
  <li><p>I have a keyfield, MATNR, which is <strong>disabled</strong> on existing records. This one does 
  not really need to have a working F4 SH icon. <strong>It must have a hotspot</strong>.</p></li>
  <li><p>When the user decides to add a new record, I want to allow F4,make the field a 
  hotspot and enable it.</p></li>
  </ul>
  
  <p>However, it turns out, that neither combining cellstyles 1-4 works (appearently there is no combining of their raws resulting in a multiple style) , nor does fieldcat-f4available = abap_true work together with fieldcat-hotspot = abap_true.</p>
  
  <p>I must admit, that I do not come often over this kind of requirements... therefore I am asking in here, if anybody knows a way (best practice preferred).</p>
  
  <p>Until now I set the cellstyles depending on row-contents, and the fieldcat is set up more or less statically.</p>
  
  <p>So in the fieldcat, F4 is set up, and in the celltab style MC_HOTSPOT is set up.
  However, this also forbids to entering values manually. Only the F4 value remapping works.</p>