Adding Line Items

I am trying to get a client script to add a line item based on a transaction custom column.  I setup the following code to execute as a Validate Line and a Field Changed Function but the line calling the function doesn't get saved.  I need a way to commit the current line first.  Any ideas?


   if (nlapiGetCurrentLineItemValue('item', 'custcol_inventoryitem') == 'Inventory Item' && nlapiGetCurrentLineItemValue('item', 'custcol_blanketorder') ==

'T')
     {
     nlapiSelectNewLineItem('item');
     nlapiSetCurrentLineItemText('item','item', 'Blanket Description', false, true);
     nlapiCommitLineItem('item');
     }