GL Upload program through FB01

Hello Experts,

We have a requirement in which we upload the GL posting data from Legacy to SAP. We are not allowed to use LSMW.

So, we wrote a program which uploads the data from Excel and transfers data to BBKPF and BBSEG.

The posting date and document date in BBKPF structure (BBKPF-BLDAT (Char 8) and BBKPF-BUDAT) takes value from excel as YYYYMMDD and I am just writing this user value to the BBKPF-BLDAT using WRITE ITAB-BLDAT TO BBKPF-BLDAT.

After successful transfer we submit the standard program RFBIBL00 and execute the session through SM35.

Here in FB01, I could see the date to be as YYYYMMDD instead converting to DD/MM/YYYY. So it says Invalid date and cannot process further.

Any help on this issue?

Appreciate for any useful inputs.

Thanks.

Sandy