diff -r bda5e7160bf6 -r c37ebdf6d03f docs/data_processing/uploading_measurements.rst
--- a/docs/data_processing/uploading_measurements.rst	Wed Mar 12 11:02:18 2014 +0200
+++ b/docs/data_processing/uploading_measurements.rst	Wed Mar 12 11:43:36 2014 +0200
@@ -22,7 +22,7 @@
     
 Sounding file (Optional)
    In this optional field you can submit a sounding file that will be used
-   by your measurements in the processing. The file needs to follow the netcdf
+   by your measurements in the processing. The file needs to follow the netCDF
    file format specified in the pdf file found in the :ref:`netcdf_file` section. 
    The file you submit will not be  necessarily connected with the 
    submitted measurement; which sounding file will be used in the processing of 
@@ -31,7 +31,7 @@
    
 Overlap file (Optional)
    In this optional field you can submit a overlap file that will be used
-   by your measurements in the processing. The file needs to follow the netcdf
+   by your measurements in the processing. The file needs to follow the netCDF
    file format specified in the pdf file found in the :ref:`netcdf_file` section. 
    The file you submit will not be  necessarily connected with the 
    submitted measurement; which overlap file will be used in the processing of 
@@ -40,7 +40,7 @@
    
 Lidar ratio file (Optional)
    In this optional field you can submit a lidar ratio file that will be used
-   by your measurements in the processing. The file needs to follow the netcdf
+   by your measurements in the processing. The file needs to follow the netCDF
    file format specified in the pdf file found in the :ref:`netcdf_file` section. 
    The file you submit will not be  necessarily connected with the 
    submitted measurement; which lidar ratio file will be used in the processing 
@@ -53,11 +53,6 @@
    section of the site. You can select multiple categories by holding down the 
    "Control" key (PC) or "Command" key (MAC) while selecting.
 
-
-Form Validation
----------------
-
-
 .. note::
    
    Uploading the measurement file can take considerable time, depending on 
@@ -74,3 +69,56 @@
    IE 9- 
       No progress bar is available (as far as we know).
 
+
+Form Validation
+---------------
+
+The data you submit in the form are check in two stages.
+
+Before you submit the form
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Before you submit the form the following checks are performed:
+
+* All the necessary fields (i.e. "system" and "data file") need to be submitted.
+
+* The ancillary file names have to be in the appropriate format described 
+  in :ref:`netcdf_file`. In brief, a sounding file should have a name 
+  rs_YYYYMMDDccNN.nc, a overlap file a name ov_YYYYMMDDccNN.nc, and a lidar ratio 
+  file a name lr_YYYYMMDDccNN.nc, where YYYY is a year, MM is the month, DD is 
+  the day, cc is the EARLINET station call sign and NN is a number. 
+
+
+After you submit the form
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+After you submit the form:
+
+* The uploaded **data file** needs to have a unique name.
+
+* The **measurement id** defined in the file should *not* exist in the SCC.
+
+* All channels declared in the measurement file should correspond to declared
+  channels in the SCC.
+
+* The submitted measurement file should have the correct netCDF format. All 
+  mandatory variables and attributes should be present in the file. All 
+  variables and attributes should have the correct type (float, integer, etc).
+  This check is not exhaustive, and it is possible that some errors are **not** 
+  detected. For example "conditionally" mandatory variables are not checked 
+  (as, for example "LR_Input", that is mandatory if elastic backscatter retrievals
+  have to be done). 
+
+If ancillary files are submitted
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Additionally, if ancillary files are also uploaded, the following checks are 
+performed:
+
+* The submitted measurement file should have the correct netCDF format. All 
+  mandatory variables and attributes should be present in the file. All 
+  variables and attributes should have the correct type (float, integer, etc).
+
+* A file with the same filename should not exist in the SCC or, if it exists, 
+  it should have status "Missing" or "Error". If a file with the same filename
+  exists, and its status is "OK" the submitted file is regected.