SAP Archiving : STO job Error (Error occurred when checking the stored archive file)

Dear gurus,

I'm encountering error in store job while doing a SAP Archiving job run.

Landscape:

1. 2 Instances of SAP (lets say A & B)

2. Both A & B are ECC 6.0

3. Both A & B are connected to Open Text Archive Server 10

Scenario:

IDOC archiving in both A & B

IDOC configuration is same in both A & B

Content repository is same in A & B

Error:

While archiving for IDOC in SAP instance A, it successfully runs. All WRITE, STORE & DELETE Jobs are successfully completed.

However while archiving IDOC in SAP instance B with the same variant details and same configuration;

The WRITE job is completed successfully.

But the STORE job gives the following error:

"Job started

Step 001 started (program RSARCH_STORE_FILE, variant , user ID XXX)

Archive file 000478-001IDOC is being processed

Archive file 000478-001IDOC does not exist

Error occured when checking the stored archive file 000478-001IDOC "

I also checked the exchange directory, the archive file is created there.

In SARA Management, the archive file is accessible

Please Advice

Thanks

Gautam