diff --git a/osc/commandline.py b/osc/commandline.py
index 2f7a4832..8f32085c 100644
--- a/osc/commandline.py
+++ b/osc/commandline.py
@@ -3014,7 +3014,7 @@ Please submit there instead, or use --nodevelproject to force direct submission.
         DESTPAC is omitted.
 
         usage:
-            osc aggregatepac SOURCEPRJ SOURCEPAC DESTPRJ [DESTPAC]
+            osc aggregatepac SOURCEPRJ SOURCEPAC[:FLAVOR] DESTPRJ [DESTPAC]
         ${cmd_option_list}
         """
 
diff --git a/osc/core.py b/osc/core.py
index 2d07c7f7..2ce95241 100644
--- a/osc/core.py
+++ b/osc/core.py
@@ -5339,19 +5339,28 @@ def link_pac(src_project, src_package, dst_project, dst_package, force, rev='',
     http_PUT(u, data=link_template)
     print('Done.')
 
-def aggregate_pac(src_project, src_package, dst_project, dst_package, repo_map = {}, disable_publish = False, nosources = False):
+
+def aggregate_pac(src_project, src_package, dst_project, dst_package, repo_map=None,
+                  disable_publish=False, nosources=False, repo_check=True):
     """
     aggregate package
      - "src" is the original package
      - "dst" is the "aggregate" package that we are creating here
      - "map" is a dictionary SRC => TARGET repository mappings
+     - "repo_check" determines if presence of repos in the source and destination repos is checked
     """
     meta_change = False
     dst_meta = ''
     apiurl = conf.config['apiurl']
+    repo_map = repo_map or {}
+
+    # we need to remove :flavor from the package names when accessing meta
+    src_package_meta = src_package.split(":")[0]
+    dst_package_meta = dst_package.split(":")[0]
+
     try:
         dst_meta = meta_exists(metatype='pkg',
-                               path_args=(quote_plus(dst_project), quote_plus(dst_package)),
+                               path_args=(quote_plus(dst_project), quote_plus(dst_package_meta)),
                                template_args=None,
                                create_new=False, apiurl=apiurl)
         root = ET.fromstring(parse_meta_to_string(dst_meta))
@@ -5363,9 +5372,37 @@ def aggregate_pac(src_project, src_package, dst_project, dst_package, repo_map =
             raise
         meta_change = True
 
+    if repo_check:
+        src_repos = set(get_repositories_of_project(apiurl, src_project))
+        dst_repos = set(get_repositories_of_project(apiurl, dst_project))
+
+        if repo_map:
+            map_from = set(repo_map.keys())
+            map_to = set(repo_map.values())
+
+            # only repos that do not exist in src/dst remain
+            delta_from = map_from - src_repos
+            delta_to = map_to - dst_repos
+
+            if delta_from or delta_to:
+                msg = ["The following repos in repo map do not exist"]
+                if delta_from:
+                    msg += ["  Source repos: " + ", ".join(sorted(delta_from))]
+                if delta_to:
+                    msg += ["  Destination repos: " + ", ".join(sorted(delta_to))]
+                raise oscerr.OscBaseError("\n".join(msg))
+        else:
+            # no overlap between src and dst repos leads to the 'broken: missing repositories: <src_project>' message
+            if not src_repos & dst_repos:
+                msg = [
+                    "The source and the destination project do not have any repository names in common.",
+                    "Use repo map to specify actual repository mapping.",
+                ]
+                raise oscerr.OscBaseError("\n".join(msg))
+
     if meta_change:
-        src_meta = show_package_meta(apiurl, src_project, src_package)
-        dst_meta = replace_pkg_meta(src_meta, dst_package, dst_project)
+        src_meta = show_package_meta(apiurl, src_project, src_package_meta)
+        dst_meta = replace_pkg_meta(src_meta, dst_package_meta, dst_project)
         meta_change = True
 
     if disable_publish:
@@ -5379,12 +5416,12 @@ def aggregate_pac(src_project, src_package, dst_project, dst_package, repo_map =
         dst_meta = ET.tostring(root, encoding=ET_ENCODING)
     if meta_change:
         edit_meta('pkg',
-                  path_args=(dst_project, dst_package),
+                  path_args=(dst_project, dst_package_meta),
                   data=dst_meta)
 
     # create the _aggregate file
     # but first, make sure not to overwrite an existing one
-    if '_aggregate' in meta_get_filelist(apiurl, dst_project, dst_package):
+    if '_aggregate' in meta_get_filelist(apiurl, dst_project, dst_package_meta):
         print(file=sys.stderr)
         print('_aggregate file already exists...! Aborting', file=sys.stderr)
         sys.exit(1)
@@ -5413,7 +5450,7 @@ def aggregate_pac(src_project, src_package, dst_project, dst_package, repo_map =
 </aggregatelist>
 """
 
-    u = makeurl(apiurl, ['source', dst_project, dst_package, '_aggregate'])
+    u = makeurl(apiurl, ['source', dst_project, dst_package_meta, '_aggregate'])
     http_PUT(u, data=aggregate_template)
     print('Done.')