Dam image mark as "outdated"

Hi,

When I'm publishing a product with a DAM reference, it said that the DAM image is outdated. Can I know what that mean? Also this image is published months ago.

When check the API, it has the status for reference DAM image.

{

"assets":

[

{

"type": "asset",

"path": "/content/dam/myimage.jpg",

"name": "myimage.jpg",

"published": true,

"outdated": true,

"status": "outdated",

"disabled": false,

"lastPublished": 1516086825781,

"lastModified": 1533277309333

}

]

}

Any help would be appreciated.

Regards,

Manh