All right, below is my solution but im pretty sure there is a better way to do this:

#Declare as public def get_allotment_id(allot_id): a = {'allotment_id':allot_id} return a

allotment = []

#Under BOM class #I defined on_change function class bom(osv.osv): .... ....

def onchange_allotment(self, cr, uid, ids, allot_id, context=None): if allot_id: x = get_allotment_id(allot_id)['allotment_id'] if len(allotment) > 0: allotment.pop()
allotment.append(x)

return {'value': {'contingency':0.00}} #just return any value in some field

# class bom_lines(osv.osv): .... ....

def _get_allot_id(self, cr, uid, context): if allotment: return allotment[0] else: raise osv.except_osv('', 'Please select allotment for this BOM.')
_columns = { 'allotment_id': fields.many2one('res.allotments', 'Allotment'), 'category_id': fields.many2one('res.allotment.category', 'Category', domain="[('allot_id','=',allotment_id)]", required=True), } .....

_defaults = { 'allotment_id': _get_allot_id,

Hello,

Does records are in relation table1's and table2's?

If yes then you able to us browse method and access all relations fields.

or do self.pool.get('tablex').browse(...., ids,...) and implement logic.

Note: In term of openerp table refer as model. so instead of table use model word when you working with openerp model/class.