Update Project's attribute value from Different Page - acumatica

Question

I need help to update the value of Project's attribute from different page.
I have fetched the attribute value in 'Appointments' page using following code.
protected void FSAppointment_RowSelected(PXCache cache, PXRowSelectedEventArgs e, PXRowSelected InvokeBaseHandler)
{
if (InvokeBaseHandler != null)
InvokeBaseHandler(cache, e);
var row = (FSAppointment)e.Row;
AppointmentEntry graph = (AppointmentEntry)cache.Graph;
if (graph.ServiceOrderRelated.Current != null)
{
int? projectID = graph.ServiceOrderRelated.Current.ProjectID;
ProjectEntry projectGraph = PXGraph.CreateInstance<ProjectEntry>();
projectGraph.Project.Current = projectGraph.Project.Search<PMProject.contractID>(projectID);
foreach (CSAnswers att in projectGraph.Answers.Select())
{
if (att.AttributeID == "ESTHOURS")
{
cache.SetValueExt<FieldService.ServiceDispatch.FSAppointmentExt.usrProjectEstimatedRemainingHours>(row, att.Value);
return;
}
}
}
}
And, now I want user to be able to update that particular attribute's value from 'Appointments' page.
For that, I had written following code by overriding the Persist method of 'Appointments' page.
public delegate void PersistDelegate();
[PXOverride]
public void Persist(PersistDelegate baseMethod)
{
if (Base.ServiceOrderRelated.Current != null)
{
using (PXTransactionScope scope = new PXTransactionScope())
{
int? projectID = Base.ServiceOrderRelated.Current.ProjectID;
ProjectEntry projectGraph = PXGraph.CreateInstance<ProjectEntry>();
var project = projectGraph.Project.Search<PMProject.contractID>(projectID);
var answers = projectGraph.Answers.Select();
foreach (CSAnswers att in answers)
{
if (att.AttributeID == "ESTHOURS")
{
att.Value = "20";
}
}
projectGraph.Actions.PressSave();
}
}
baseMethod();
}
But still it is not updating the value.

Answer 1

The thing to realize is that the attribute system is different that the usual DAC->SQL system. CSAnswers is a unnormalized table of values for all the attributes. They are linked to a DAC document by RefNoteID. See select * from CSAnswers where AttributeID = 'ESTHOURS' In the code above you are altering every project's 'esthours'. You're also missing a statement where you tell the graph to update the cache with your altered object. Something like projectGraph.Answers.Update(att);