ERROR UPDATING ADOGRID TEXTFIELDS

I open a Database, wich is connexted to a ADOrecordset,
on mainform  some fields  e.g.  Name, Street, City, Phone, Fax
when I 'click/walk" through  grid displaying on mainform works fine
because thes field have datasource as ADObrookers, Datafield  'their table name'
BUT: as soon as I start changing (to save later), or even typing in e.g. streetaddress
I get this error
----------------------------------------------------------------------------------------
>Binding Collection Error
>Field not updatable, Bound Property Name: Text, Field Name: BrokerStreet
----------------------------------------------------------------------------------------

This is how we open.
 Sql = "SELECT * from Brookers order by brokernum"
 rsBrokers.CursorLocation = adUseServer
 rsBrokers.CursorType = adOpenKeyset
 rsBrokers.LockType = adLockOptimistic
 rsBrokers.Open "brookers", "provider=PervasiveOLEDB;Data source=Newindia", adOpenDynamic,  adLockOptimistic, adCmdTable
 adoBrookers.CommandType = adCmdText
 adoBrookers.RecordSource = Sql
 adoBrookers.Refresh
 rsBrokers.MoveFirst

BUT:
If I open like this, no error

 Sql = "SELECT * from Brookers order by brokernum"
 rsBrokers.CursorLocation = adUseServer
 rsBrokers.CursorType = adOpenKeyset
 rsBrokers.LockType = adLockOptimistic
 rsBrokers.Open "brookers", "provider=PervasiveOLEDB;Data source=Newindia", adOpenDynamic,  adLockOptimistic, adCmdTable
 rem skip               adoBrookers.CommandType = adCmdText
 rem skip                adoBrookers.RecordSource = Sql
 rem skip                adoBrookers.Refresh
 rsBrokers.MoveFirst

I prefer to open the first way , because then I have the option
to change Sql  setting, and can call the adoBrookers.Refresh after e.g.  deleting record

So what do I wrong?
Regards Jack