Acumatica - field type decimal getting cast error - casting

Question

Customized decimal type field generates error after being published.
I've tried many different syntaxes, if isnull(), etc and for some reason I am not thinking to try the right one.
if (tran != null && tran.TranLineNbr != null &&
arTran != null && arTran.TranType == tran.TranType &&
arTran.RefNbr == tran.RefNbr && arTran.LineNbr == tran.TranLineNbr)
{
decimal? amtOrg = arTran.GetExtension<ARTranExt>().UsrDLYAMTORG;
tran.GetExtension<GLTranExt>().UsrDLYAMTORG = amtOrg;
}
The value on release should go from Ar to Gl. All the other custom fields work, but not the decimal.
"Error: An error occurred during processing of the field Original Amount. Specified cast is not valid."

Answer 1

Your data access class should look similar to
/// <summary>
/// Adds extension fields to and modifies attributes in <see cref="ARTran"/>.
/// </summary>
public sealed class ARTranExt : PXCacheExtension<ARTran>
{
public abstract class usrDLYAMTORG : IBqlField
{
}
[PXDBDecimal]
[PXUIField(DisplayName = "Your Field Name")]
[PXDefault(TypeCode.Decimal, "0.00", PersistingCheck = PXPersistingCheck.Nothing)]
public decimal? UsrDLYAMTORG { get; set; }
}
In regards to bringing a custom value from AR to GL on release we have accomplished the same with the following code.
public class ARReleaseProcessExtension : PXGraphExtension<ARReleaseProcess>
{
public delegate GLTran InsertInvoiceDetailsTransactionDel(JournalEntry je, GLTran tran, ARReleaseProcess.GLTranInsertionContext context);
[PXOverride]
public virtual GLTran InsertInvoiceDetailsTransaction(JournalEntry je, GLTran tran, ARReleaseProcess.GLTranInsertionContext context, InsertInvoiceDetailsTransactionDel del)
{
tran.GetExtension<GLTranExt>().UsrDLYAMTORG = context.ARTranRecord.GetExtension<ARTranExt>().UsrDLYAMTORG;
return del?.Invoke(je, tran, context);
}
}