If you are missing rows in the Fact table, it is likely that Excel is determining the data type of the column based the IDs that are numbers, and not bringing in the ones that look like text. Go into the PowerPivot window and select the Fact table. Click on the column with ID and in the Ribbon under Formatting, look for Data Type. This is probably showing Whole Number.
I am assuming the source of the data is an Excel / Text / CSV file rather than a link to a database table, is that correct?
If the above is correct, my suggestion is to create a 2 line file based on the Fact table, with the header and a single data line, with RO1334 as the ID (if any of the other columns are getting incorrectly tagged, ensure the data in each column represents the data type you want for the whole table going forward.
At this point, if you have not done much, start a new file and import this small Fact file. Once that is imported, then Edit the connection and point to the main file. Excel should remember the data type for ID to be Text and import all the rows.
You can solve this with Schema.ini files, but this might take a bit of reading to understand how to approach it.
If that does not seem to be the issue, please provide more details.
Cheers