How to make a field required

Hi ​@ahafemann,

I believe you will need to create a customization to achieve this.

You can write the logic in the RowPersisting event and use a BQL query to fetch the attachment for the current record.

The code snippet below will help you head in the right direction:

using PX.Data;
using PX.Objects.EP; 
using PX.SM;         
using System.Linq;

namespace test
{
    public class ExpenseReceiptEntry_Extension : PXGraphExtension<ExpenseReceiptEntry>
    {
        protected void EPExpenseReceipt_RowPersisting(PXCache cache, PXRowPersistingEventArgs e)
        {
            var row = (EPExpenseReceipt)e.Row;
            if (row == null) return;

            // Check if the document is being inserted or updated
            if (e.Operation != PXDBOperation.Insert && e.Operation != PXDBOperation.Update)
                return;

            // Get the NoteID (attachment link)
            Guid? noteID = row.NoteID;

            if (noteID == null)
            {
                PXTrace.WriteError($"Expense Receipt {row.ReceiptNbr} has no NoteID.");
                return;
            }

            // Check for attachments
            var hasAttachments = PXSelect<UploadFileRevision,
                Where<UploadFileRevision.noteID, Equal<Required<UploadFileRevision.noteID>>>>
                .Select(Base, noteID)
                .Any();

            if (!hasAttachments)
            {
                cache.RaiseExceptionHandling<EPExpenseReceipt.receiptNbr>(
                    row,
                    row.ReceiptNbr,
                    new PXSetPropertyException("An attachment is required for this expense receipt.", PXErrorLevel.Error)
                );

                throw new PXRowPersistingException(
                    nameof(EPExpenseReceipt.receiptNbr),
                    row.ReceiptNbr,
                    "An attachment is required for this expense receipt."
                );
            }
        }
    }
}