2741087 - Inconsistent behavior inserting a new row, a null value found, even though a new record is committed - SAP ASE

create table foo (a int) lock datarows
go

insert into foo values (1)
go

Session 1:

begin tran
delete foo where a = 1
go

insert into foo values (1)
go

Session 2:

select @@isolation , count(*) , sum(a) from foo
go

Go back to session 1 and commit the data:

The first time it returns the data

The second time it returns null. Why?

Adaptive Server Enterprise All versions.

KBA , BC-SYB-ASE , Sybase ASE Database Platform (non Business Suite) , How To