2012.1 breaks validateField using nlapiGetCurrentLineItemValue()

In suitescript, validateField scripts are supposed to allow us to validate a fields values before the field is changed.

For a normal body field, this works as expected.
> nlapiGetFieldValue('custbody_notes_add')
"123"
//changing field from 123 to 123456
media.nl:397 jm_validateField: type:null name:custbody_notes_add
> nlapiGetFieldValue('custbody_notes_add')
"123456"
media.nl:195 jm_fieldChanged: type:null name:custbody_notes_add
> nlapiGetFieldValue('custbody_notes_add')
"123456"


For a column field this does not work correctly.
> nlapiGetCurrentLineItemValue('item','custcol_qty_bo')
"0"
//changing field from 0 to 1
media.nl:397 jm_validateField: type:item name:custcol_qty_bo
> nlapiGetCurrentLineItemValue('item','custcol_qty_bo')